20455897 has 12 divisors (see below), whose sum is σ = 25697728. Its totient is φ = 15939000.

The previous prime is 20455891. The next prime is 20455907. The reversal of 20455897 is 79855402.

It is not a de Polignac number, because 20455897 - 2¹⁵ = 20423129 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20455891) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 11229 + ... + 12922.

Almost surely, 2^20455897 is an apocalyptic number.

It is an amenable number.

20455897 is a deficient number, since it is larger than the sum of its proper divisors (5241831).

20455897 is a wasteful number, since it uses less digits than its factorization.

20455897 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24180 (or 24169 counting only the distinct ones).

The product of its (nonzero) digits is 100800, while the sum is 40.

The square root of 20455897 is about 4522.8195851703. The cubic root of 20455897 is about 273.4887771721.

The spelling of 20455897 in words is "twenty million, four hundred fifty-five thousand, eight hundred ninety-seven".