19720002197 has 16 divisors (see below), whose sum is σ = 22894968960. Its totient is φ = 16634965248.

The previous prime is 19720002167. The next prime is 19720002209. The reversal of 19720002197 is 79120002791.

It is a cyclic number.

It is not a de Polignac number, because 19720002197 - 2²⁰ = 19718953621 is a prime.

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 19720002197.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19720002167) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 495329 + ... + 533657.

It is an arithmetic number, because the mean of its divisors is an integer number (1430935560).

Almost surely, 2^19720002197 is an apocalyptic number.

It is an amenable number.

19720002197 is a deficient number, since it is larger than the sum of its proper divisors (3174966763).

19720002197 is a wasteful number, since it uses less digits than its factorization.

19720002197 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39500.

The product of its (nonzero) digits is 15876, while the sum is 38.

The spelling of 19720002197 in words is "nineteen billion, seven hundred twenty million, two thousand, one hundred ninety-seven".