19720056474 has 128 divisors (see below), whose sum is σ = 48018216960. Its totient is φ = 5971968000.

The previous prime is 19720056469. The next prime is 19720056487. The reversal of 19720056474 is 47465002791.

19720056474 is a `hidden beast` number, since 19 + 7 + 2 + 0 + 0 + 564 + 74 = 666.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 17102682 + ... + 17103834.

It is an arithmetic number, because the mean of its divisors is an integer number (375142320).

Almost surely, 2^19720056474 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 19720056474, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24009108480).

19720056474 is an abundant number, since it is smaller than the sum of its proper divisors (28298160486).

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

19720056474 is a wasteful number, since it uses less digits than its factorization.

19720056474 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1813 (or 1807 counting only the distinct ones).

The product of its (nonzero) digits is 423360, while the sum is 45.

The spelling of 19720056474 in words is "nineteen billion, seven hundred twenty million, fifty-six thousand, four hundred seventy-four".