19881080 has 32 divisors (see below), whose sum is σ = 44861040. Its totient is φ = 7929600.

The previous prime is 19881079. The next prime is 19881097. The reversal of 19881080 is 8018891.

It is a Smith number, since the sum of its digits (35) coincides with the sum of the digits of its prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 19881080.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23627 + ... + 24453.

Almost surely, 2^19881080 is an apocalyptic number.

19881080 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

19881080 is an abundant number, since it is smaller than the sum of its proper divisors (24979960).

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

19881080 is a wasteful number, since it uses less digits than its factorization.

19881080 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1439 (or 1435 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 35.

The square root of 19881080 is about 4458.8204718288. The cubic root of 19881080 is about 270.9026942403.

The spelling of 19881080 in words is "nineteen million, eight hundred eighty-one thousand, eighty".