19956391792 has 10 divisors (see below), whose sum is σ = 38665509128. Its totient is φ = 9978195888.

The previous prime is 19956391751. The next prime is 19956391799. The reversal of 19956391792 is 29719365991.

It is a self number, because there is not a number n which added to its sum of digits gives 19956391792.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19956391799) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 623637228 + ... + 623637259.

Almost surely, 2^19956391792 is an apocalyptic number.

It is an amenable number.

19956391792 is a deficient number, since it is larger than the sum of its proper divisors (18709117336).

19956391792 is a wasteful number, since it uses less digits than its factorization.

19956391792 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1247274495 (or 1247274489 counting only the distinct ones).

The product of its digits is 8266860, while the sum is 61.

The spelling of 19956391792 in words is "nineteen billion, nine hundred fifty-six million, three hundred ninety-one thousand, seven hundred ninety-two".