20206881 has 32 divisors (see below), whose sum is σ = 31363200. Its totient is φ = 12841920.

The previous prime is 20206867. The next prime is 20206889. The reversal of 20206881 is 18860202.

It is not a de Polignac number, because 20206881 - 2⁶ = 20206817 is a prime.

It is a super-2 number, since 2×20206881² = 816636079496322, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (20206889) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 102475 + ... + 102671.

It is an arithmetic number, because the mean of its divisors is an integer number (980100).

Almost surely, 2^20206881 is an apocalyptic number.

It is an amenable number.

20206881 is a deficient number, since it is larger than the sum of its proper divisors (11156319).

20206881 is a wasteful number, since it uses less digits than its factorization.

20206881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 366 (or 360 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 27.

The square root of 20206881 is about 4495.2064468720. The cubic root of 20206881 is about 272.3744886741.

The spelling of 20206881 in words is "twenty million, two hundred six thousand, eight hundred eighty-one".