20923992 has 24 divisors (see below), whose sum is σ = 56669340. Its totient is φ = 6974640.

The previous prime is 20923979. The next prime is 20923999. The reversal of 20923992 is 29932902.

It is a tau number, because it is divible by the number of its divisors (24).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20923999) 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 5 ways as a sum of consecutive naturals, for example, 145234 + ... + 145377.

Almost surely, 2^20923992 is an apocalyptic number.

It is an amenable number.

20923992 is an abundant number, since it is smaller than the sum of its proper divisors (35745348).

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

20923992 is a wasteful number, since it uses less digits than its factorization.

20923992 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 290623 (or 290616 counting only the distinct ones).

The product of its (nonzero) digits is 17496, while the sum is 36.

The square root of 20923992 is about 4574.2750245257. The cubic root of 20923992 is about 275.5591576108.

It can be divided in two parts, 2092 and 3992, that added together give a square (6084 = 78²).

The spelling of 20923992 in words is "twenty million, nine hundred twenty-three thousand, nine hundred ninety-two".