20920992 has 48 divisors (see below), whose sum is σ = 55157760. Its totient is φ = 6943232.

The previous prime is 20920981. The next prime is 20920993. The reversal of 20920992 is 29902902.

It is a tau number, because it is divible by the number of its divisors (48).

It is not an unprimeable number, because it can be changed into a prime (20920993) by changing a digit.

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, 36484 + ... + 37052.

It is an arithmetic number, because the mean of its divisors is an integer number (1149120).

Almost surely, 2^20920992 is an apocalyptic number.

It is an amenable number.

20920992 is an abundant number, since it is smaller than the sum of its proper divisors (34236768).

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

20920992 is a wasteful number, since it uses less digits than its factorization.

20920992 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 965 (or 957 counting only the distinct ones).

The product of its (nonzero) digits is 5832, while the sum is 33.

The square root of 20920992 is about 4573.9470919546. The cubic root of 20920992 is about 275.5459874506.

It can be divided in two parts, 20920 and 992, that added together give a palindrome (21912).

The spelling of 20920992 in words is "twenty million, nine hundred twenty thousand, nine hundred ninety-two".