19722179790 has 24 divisors (see below), whose sum is σ = 51277667688. Its totient is φ = 5259247920.

The previous prime is 19722179773. The next prime is 19722179801. The reversal of 19722179790 is 9797122791.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 109567576 + ... + 109567755.

It is an arithmetic number, because the mean of its divisors is an integer number (2136569487).

Almost surely, 2^19722179790 is an apocalyptic number.

19722179790 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

19722179790 is an abundant number, since it is smaller than the sum of its proper divisors (31555487898).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

19722179790 is a wasteful number, since it uses less digits than its factorization.

19722179790 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 219135344 (or 219135341 counting only the distinct ones).

The product of its (nonzero) digits is 1000188, while the sum is 54.

The spelling of 19722179790 in words is "nineteen billion, seven hundred twenty-two million, one hundred seventy-nine thousand, seven hundred ninety".