20861364 has 24 divisors (see below), whose sum is σ = 49809760. Its totient is φ = 6791904.

The previous prime is 20861339. The next prime is 20861371. The reversal of 20861364 is 46316802.

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 7 ways as a sum of consecutive naturals, for example, 19699 + ... + 20730.

Almost surely, 2^20861364 is an apocalyptic number.

It is an amenable number.

20861364 is an abundant number, since it is smaller than the sum of its proper divisors (28948396).

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

20861364 is a wasteful number, since it uses less digits than its factorization.

20861364 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40479 (or 40477 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 30.

The square root of 20861364 is about 4567.4242194042. The cubic root of 20861364 is about 275.2839557318.

The spelling of 20861364 in words is "twenty million, eight hundred sixty-one thousand, three hundred sixty-four".