Find all divisors of i and add them
for j in range ( 1 , i + 1 ) : NEW_LINE INDENT if j * j > i : NEW_LINE INDENT break NEW_LINE DEDENT if ( i % j == 0 ) : NEW_LINE INDENT if ( i // j == j ) : NEW_LINE INDENT sum += j NEW_LINE DEDENT else : NEW_LINE INDENT sum += j + i // j NEW_LINE DEDENT DEDENT DEDENT