20865051 has 12 divisors (see below), whose sum is σ = 30225312. Its totient is φ = 13869936.

The previous prime is 20865041. The next prime is 20865067. The reversal of 20865051 is 15056802.

20865051 is a `hidden beast` number, since 2 + 0 + 8 + 650 + 5 + 1 = 666.

It is not a de Polignac number, because 20865051 - 2⁷ = 20864923 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20865041) 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, 145 + ... + 6461.

It is an arithmetic number, because the mean of its divisors is an integer number (2518776).

Almost surely, 2^20865051 is an apocalyptic number.

20865051 is a deficient number, since it is larger than the sum of its proper divisors (9360261).

20865051 is a wasteful number, since it uses less digits than its factorization.

20865051 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6690 (or 6687 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 27.

The square root of 20865051 is about 4567.8278207481. The cubic root of 20865051 is about 275.3001725071.

The spelling of 20865051 in words is "twenty million, eight hundred sixty-five thousand, fifty-one".