20956923 has 12 divisors (see below), whose sum is σ = 32599840. Its totient is φ = 12896496.

The previous prime is 20956909. The next prime is 20956927. The reversal of 20956923 is 32965902.

It is not a de Polignac number, because 20956923 - 2⁴ = 20956907 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20956927) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 89443 + ... + 89676.

Almost surely, 2^20956923 is an apocalyptic number.

20956923 is a deficient number, since it is larger than the sum of its proper divisors (11642917).

20956923 is a wasteful number, since it uses less digits than its factorization.

20956923 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 179138 (or 179135 counting only the distinct ones).

The product of its (nonzero) digits is 29160, while the sum is 36.

The square root of 20956923 is about 4577.8731961469. The cubic root of 20956923 is about 275.7036437778.

The spelling of 20956923 in words is "twenty million, nine hundred fifty-six thousand, nine hundred twenty-three".