19720861104 has 40 divisors (see below), whose sum is σ = 58223495680. Its totient is φ = 5634531648.

The previous prime is 19720861099. The next prime is 19720861109. The reversal of 19720861104 is 40116802791.

It is an interprime number because it is at equal distance from previous prime (19720861099) and next prime (19720861109).

It is not an unprimeable number, because it can be changed into a prime (19720861109) 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, 29346184 + ... + 29346855.

It is an arithmetic number, because the mean of its divisors is an integer number (1455587392).

Almost surely, 2^19720861104 is an apocalyptic number.

19720861104 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

19720861104 is an abundant number, since it is smaller than the sum of its proper divisors (38502634576).

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

19720861104 is a wasteful number, since it uses less digits than its factorization.

19720861104 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58693057 (or 58693051 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 39.

The spelling of 19720861104 in words is "nineteen billion, seven hundred twenty million, eight hundred sixty-one thousand, one hundred four".