19972409524 has 24 divisors (see below), whose sum is σ = 36094728488. Its totient is φ = 9662613120.

The previous prime is 19972409521. The next prime is 19972409593. The reversal of 19972409524 is 42590427991.

It can be written as a sum of positive squares in 4 ways, for example, as 5640010000 + 14332399524 = 75100^2 + 119718^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19972409521) 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, 345999 + ... + 399574.

Almost surely, 2^19972409524 is an apocalyptic number.

It is an amenable number.

19972409524 is a deficient number, since it is larger than the sum of its proper divisors (16122318964).

19972409524 is a wasteful number, since it uses less digits than its factorization.

19972409524 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 745795 (or 745793 counting only the distinct ones).

The product of its (nonzero) digits is 1632960, while the sum is 52.

The spelling of 19972409524 in words is "nineteen billion, nine hundred seventy-two million, four hundred nine thousand, five hundred twenty-four".