20881880 has 16 divisors (see below), whose sum is σ = 46984320. Its totient is φ = 8352736.

The previous prime is 20881873. The next prime is 20881897. The reversal of 20881880 is 8818802.

It is a self number, because there is not a number n which added to its sum of digits gives 20881880.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 260984 + ... + 261063.

It is an arithmetic number, because the mean of its divisors is an integer number (2936520).

Almost surely, 2^20881880 is an apocalyptic number.

20881880 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20881880 is an abundant number, since it is smaller than the sum of its proper divisors (26102440).

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

20881880 is a wasteful number, since it uses less digits than its factorization.

20881880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 522058 (or 522054 counting only the distinct ones).

The product of its (nonzero) digits is 8192, while the sum is 35.

The square root of 20881880 is about 4569.6695722995. The cubic root of 20881880 is about 275.3741683570.

The spelling of 20881880 in words is "twenty million, eight hundred eighty-one thousand, eight hundred eighty".