20864992 has 24 divisors (see below), whose sum is σ = 41954976. Its totient is φ = 10209792.

The previous prime is 20864981. The next prime is 20864993. The reversal of 20864992 is 29946802.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20864993) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5433 + ... + 8440.

It is an arithmetic number, because the mean of its divisors is an integer number (1748124).

Almost surely, 2^20864992 is an apocalyptic number.

It is an amenable number.

20864992 is an abundant number, since it is smaller than the sum of its proper divisors (21089984).

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

20864992 is a wasteful number, since it uses less digits than its factorization.

20864992 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13930 (or 13922 counting only the distinct ones).

The product of its (nonzero) digits is 62208, while the sum is 40.

The square root of 20864992 is about 4567.8213625316. The cubic root of 20864992 is about 275.2999130185.

The spelling of 20864992 in words is "twenty million, eight hundred sixty-four thousand, nine hundred ninety-two".