20955897 has 12 divisors (see below), whose sum is σ = 30311424. Its totient is φ = 13951320.

The previous prime is 20955877. The next prime is 20955899. The reversal of 20955897 is 79855902.

It is a happy number.

20955897 is a `hidden beast` number, since 2 + 0 + 9 + 558 + 97 = 666.

It is not a de Polignac number, because 20955897 - 2⁶ = 20955833 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20955899) 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, 8872 + ... + 10982.

It is an arithmetic number, because the mean of its divisors is an integer number (2525952).

Almost surely, 2^20955897 is an apocalyptic number.

It is an amenable number.

20955897 is a deficient number, since it is larger than the sum of its proper divisors (9355527).

20955897 is a wasteful number, since it uses less digits than its factorization.

20955897 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3220 (or 3217 counting only the distinct ones).

The product of its (nonzero) digits is 226800, while the sum is 45.

The square root of 20955897 is about 4577.7611340043. The cubic root of 20955897 is about 275.6991444444.

The spelling of 20955897 in words is "twenty million, nine hundred fifty-five thousand, eight hundred ninety-seven".