20888900 has 18 divisors (see below), whose sum is σ = 45329130. Its totient is φ = 8355520.

The previous prime is 20888897. The next prime is 20888909. The reversal of 20888900 is 988802.

It can be written as a sum of positive squares in 3 ways, for example, as 222784 + 20666116 = 472^2 + 4546^2 .

It is a super-2 number, since 2×20888900² = 872692286420000, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20888909) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 104345 + ... + 104544.

It is an arithmetic number, because the mean of its divisors is an integer number (2518285).

Almost surely, 2^20888900 is an apocalyptic number.

20888900 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20888900 is an abundant number, since it is smaller than the sum of its proper divisors (24440230).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20888900 is a wasteful number, since it uses less digits than its factorization.

20888900 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 208903 (or 208896 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 35.

The square root of 20888900 is about 4570.4376158088. The cubic root of 20888900 is about 275.4050230195.

The spelling of 20888900 in words is "twenty million, eight hundred eighty-eight thousand, nine hundred".