20900992 has 32 divisors (see below), whose sum is σ = 47589120. Its totient is φ = 8957184.

The previous prime is 20900989. The next prime is 20900993. The reversal of 20900992 is 29900902.

It is a tau number, because it is divible by the number of its divisors (32).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20900993) 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, 10768 + ... + 12559.

It is an arithmetic number, because the mean of its divisors is an integer number (1487160).

Almost surely, 2^20900992 is an apocalyptic number.

It is an amenable number.

20900992 is an abundant number, since it is smaller than the sum of its proper divisors (26688128).

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

20900992 is an equidigital number, since it uses as much as digits as its factorization.

20900992 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23348 (or 23336 counting only the distinct ones).

The product of its (nonzero) digits is 2916, while the sum is 31.

The square root of 20900992 is about 4571.7602736801. The cubic root of 20900992 is about 275.4581541906.

The spelling of 20900992 in words is "twenty million, nine hundred thousand, nine hundred ninety-two".