19928980 has 24 divisors (see below), whose sum is σ = 42134400. Its totient is φ = 7917600.

The previous prime is 19928959. The next prime is 19928983. The reversal of 19928980 is 8982991.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 19928980.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19928983) 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, 280 + ... + 6319.

It is an arithmetic number, because the mean of its divisors is an integer number (1755600).

Almost surely, 2^19928980 is an apocalyptic number.

19928980 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

19928980 is an abundant number, since it is smaller than the sum of its proper divisors (22205420).

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

19928980 is a wasteful number, since it uses less digits than its factorization.

19928980 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6759 (or 6757 counting only the distinct ones).

The product of its (nonzero) digits is 93312, while the sum is 46.

The square root of 19928980 is about 4464.1886160869. The cubic root of 19928980 is about 271.1200840342.

The spelling of 19928980 in words is "nineteen million, nine hundred twenty-eight thousand, nine hundred eighty".