20656937 has 4 divisors (see below), whose sum is σ = 23607936. Its totient is φ = 17705940.

The previous prime is 20656927. The next prime is 20656963. The reversal of 20656937 is 73965602.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 20656937 - 2⁶ = 20656873 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20656937.

It is not an unprimeable number, because it can be changed into a prime (20656927) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1475489 + ... + 1475502.

It is an arithmetic number, because the mean of its divisors is an integer number (5901984).

Almost surely, 2^20656937 is an apocalyptic number.

It is an amenable number.

20656937 is a deficient number, since it is larger than the sum of its proper divisors (2950999).

20656937 is an equidigital number, since it uses as much as digits as its factorization.

20656937 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2950998.

The product of its (nonzero) digits is 68040, while the sum is 38.

The square root of 20656937 is about 4544.9903190216. The cubic root of 20656937 is about 274.3818047375.

The spelling of 20656937 in words is "twenty million, six hundred fifty-six thousand, nine hundred thirty-seven".