20681884 has 12 divisors (see below), whose sum is σ = 36652000. Its totient is φ = 10209888.

The previous prime is 20681879. The next prime is 20681891. The reversal of 20681884 is 48818602.

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, 32409 + ... + 33040.

Almost surely, 2^20681884 is an apocalyptic number.

It is an amenable number.

20681884 is a deficient number, since it is larger than the sum of its proper divisors (15970116).

20681884 is a wasteful number, since it uses less digits than its factorization.

20681884 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65532 (or 65530 counting only the distinct ones).

The product of its (nonzero) digits is 24576, while the sum is 37.

The square root of 20681884 is about 4547.7339412063. The cubic root of 20681884 is about 274.4922155759.

The spelling of 20681884 in words is "twenty million, six hundred eighty-one thousand, eight hundred eighty-four".