19920920 has 32 divisors (see below), whose sum is σ = 44982000. Its totient is φ = 7939968.

The previous prime is 19920919. The next prime is 19920947. The reversal of 19920920 is 2902991.

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, 13247 + ... + 14673.

Almost surely, 2^19920920 is an apocalyptic number.

19920920 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

19920920 is an abundant number, since it is smaller than the sum of its proper divisors (25061080).

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

19920920 is a wasteful number, since it uses less digits than its factorization.

19920920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1787 (or 1783 counting only the distinct ones).

The product of its (nonzero) digits is 2916, while the sum is 32.

The square root of 19920920 is about 4463.2857851587. The cubic root of 19920920 is about 271.0835288511.

The spelling of 19920920 in words is "nineteen million, nine hundred twenty thousand, nine hundred twenty".