20625656 has 8 divisors (see below), whose sum is σ = 38673120. Its totient is φ = 10312824.

The previous prime is 20625653. The next prime is 20625667. The reversal of 20625656 is 65652602.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20625653) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1289096 + ... + 1289111.

It is an arithmetic number, because the mean of its divisors is an integer number (4834140).

Almost surely, 2^20625656 is an apocalyptic number.

It is an amenable number.

20625656 is a deficient number, since it is larger than the sum of its proper divisors (18047464).

20625656 is a wasteful number, since it uses less digits than its factorization.

20625656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2578213 (or 2578209 counting only the distinct ones).

The product of its (nonzero) digits is 21600, while the sum is 32.

The square root of 20625656 is about 4541.5477537950. The cubic root of 20625656 is about 274.2432350923.

The spelling of 20625656 in words is "twenty million, six hundred twenty-five thousand, six hundred fifty-six".