19928920 has 32 divisors (see below), whose sum is σ = 48917520. Its totient is φ = 7246720.

The previous prime is 19928917. The next prime is 19928921. The reversal of 19928920 is 2982991.

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19928921) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22207 + ... + 23086.

Almost surely, 2^19928920 is an apocalyptic number.

19928920 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

19928920 is an abundant number, since it is smaller than the sum of its proper divisors (28988600).

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

19928920 is a wasteful number, since it uses less digits than its factorization.

19928920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45315 (or 45311 counting only the distinct ones).

The product of its (nonzero) digits is 23328, while the sum is 40.

The square root of 19928920 is about 4464.1818959357. The cubic root of 19928920 is about 271.1198119477.

The spelling of 19928920 in words is "nineteen million, nine hundred twenty-eight thousand, nine hundred twenty".