19918980 has 48 divisors (see below), whose sum is σ = 61971840. Its totient is φ = 5311584.

The previous prime is 19918967. The next prime is 19918993. The reversal of 19918980 is 8981991.

It is an interprime number because it is at equal distance from previous prime (19918967) and next prime (19918993).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17904 + ... + 18983.

It is an arithmetic number, because the mean of its divisors is an integer number (1291080).

Almost surely, 2^19918980 is an apocalyptic number.

19918980 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

19918980 is an abundant number, since it is smaller than the sum of its proper divisors (42052860).

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

19918980 is a wasteful number, since it uses less digits than its factorization.

19918980 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36905 (or 36897 counting only the distinct ones).

The product of its (nonzero) digits is 46656, while the sum is 45.

The square root of 19918980 is about 4463.0684511892. The cubic root of 19918980 is about 271.0747287368.

The spelling of 19918980 in words is "nineteen million, nine hundred eighteen thousand, nine hundred eighty".