19800711180 has 36 divisors (see below), whose sum is σ = 60062157792. Its totient is φ = 5280189600.

The previous prime is 19800711131. The next prime is 19800711181. The reversal of 19800711180 is 8111700891.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (19800711181) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 55001796 + ... + 55002155.

It is an arithmetic number, because the mean of its divisors is an integer number (1668393272).

Almost surely, 2^19800711180 is an apocalyptic number.

19800711180 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

19800711180 is an abundant number, since it is smaller than the sum of its proper divisors (40261446612).

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

19800711180 is a wasteful number, since it uses less digits than its factorization.

19800711180 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 110003966 (or 110003961 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 36.

It can be divided in two parts, 19800711 and 180, that added together give a palindrome (19800891).

The spelling of 19800711180 in words is "nineteen billion, eight hundred million, seven hundred eleven thousand, one hundred eighty".