1020656 has 40 divisors (see below), whose sum is σ = 2437344. Its totient is φ = 403200.

The previous prime is 1020631. The next prime is 1020667. The reversal of 1020656 is 6560201.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1106 + ... + 1806.

2^1020656 is an apocalyptic number.

1020656 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1020656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1218672).

1020656 is an abundant number, since it is smaller than the sum of its proper divisors (1416688).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1020656 is a wasteful number, since it uses less digits than its factorization.

1020656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 729 (or 723 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 20.

The square root of 1020656 is about 1010.2752100294. The cubic root of 1020656 is about 100.6838462169.

Adding to 1020656 its reverse (6560201), we get a palindrome (7580857).

It can be divided in two parts, 10206 and 56, that multiplied together give a square (571536 = 756²).

The spelling of 1020656 in words is "one million, twenty thousand, six hundred fifty-six".