20963889 has 12 divisors (see below), whose sum is σ = 30349696. Its totient is φ = 13944312.

The previous prime is 20963881. The next prime is 20963893. The reversal of 20963889 is 98836902.

20963889 is a `hidden beast` number, since 2 + 0 + 9 + 638 + 8 + 9 = 666.

It is not a de Polignac number, because 20963889 - 2³ = 20963881 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20963881) 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, 1992 + ... + 6774.

Almost surely, 2^20963889 is an apocalyptic number.

It is an amenable number.

20963889 is a deficient number, since it is larger than the sum of its proper divisors (9385807).

20963889 is a wasteful number, since it uses less digits than its factorization.

20963889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5276 (or 5273 counting only the distinct ones).

The product of its (nonzero) digits is 186624, while the sum is 45.

The square root of 20963889 is about 4578.6339665887. The cubic root of 20963889 is about 275.7341880015.

The spelling of 20963889 in words is "twenty million, nine hundred sixty-three thousand, eight hundred eighty-nine".