20881900 has 36 divisors (see below), whose sum is σ = 48802432. Its totient is φ = 7709760.

The previous prime is 20881897. The next prime is 20881901. The reversal of 20881900 is 918802.

It is a super-2 number, since 2×20881900² = 872107495220000, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20881901) 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, 6732 + ... + 9331.

Almost surely, 2^20881900 is an apocalyptic number.

20881900 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20881900 is an abundant number, since it is smaller than the sum of its proper divisors (27920532).

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

20881900 is a wasteful number, since it uses less digits than its factorization.

20881900 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16090 (or 16083 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 28.

The square root of 20881900 is about 4569.6717606410. The cubic root of 20881900 is about 275.3742562719.

The spelling of 20881900 in words is "twenty million, eight hundred eighty-one thousand, nine hundred".