19900524002 has 18 divisors (see below), whose sum is σ = 31212271713. Its totient is φ = 9515447392.

The previous prime is 19900524001. The next prime is 19900524023. The reversal of 19900524002 is 20042500991.

It can be written as a sum of positive squares in 2 ways, for example, as 12071636641 + 7828887361 = 109871^2 + 88481^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=99751.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 19900524002.

It is not an unprimeable number, because it can be changed into a prime (19900524001) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 4586378 + ... + 4590714.

Almost surely, 2^19900524002 is an apocalyptic number.

19900524002 is a deficient number, since it is larger than the sum of its proper divisors (11311747711).

19900524002 is an frugal number, since it uses more digits than its factorization.

19900524002 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8722 (or 4362 counting only the distinct ones).

The product of its (nonzero) digits is 6480, while the sum is 32.

Multiplying 19900524002 by its sum of digits (32), we get a square (636816768064 = 798008²).

The spelling of 19900524002 in words is "nineteen billion, nine hundred million, five hundred twenty-four thousand, two".