19820697796 has 9 divisors (see below), whose sum is σ = 34686713901. Its totient is φ = 9910208112.

The previous prime is 19820697779. The next prime is 19820697839. The reversal of 19820697796 is 69779602891.

The square root of 19820697796 is 140786.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 12821032900 + 6999664896 = 113230^2 + 83664^2 .

It is a super-2 number, since 2×19820697796² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 246376 + ... + 316768.

Almost surely, 2^19820697796 is an apocalyptic number.

19820697796 is the 140786-th square number.

It is an amenable number.

19820697796 is a deficient number, since it is larger than the sum of its proper divisors (14866016105).

19820697796 is an frugal number, since it uses more digits than its factorization.

19820697796 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 140790 (or 70395 counting only the distinct ones).

The product of its (nonzero) digits is 20575296, while the sum is 64.

Multiplying 19820697796 by its sum of digits (64), we get a square (1268524658944 = 1126288²).

The spelling of 19820697796 in words is "nineteen billion, eight hundred twenty million, six hundred ninety-seven thousand, seven hundred ninety-six".