20392421172 has 12 divisors (see below), whose sum is σ = 47582316096. Its totient is φ = 6797473720.

The previous prime is 20392421047. The next prime is 20392421201. The reversal of 20392421172 is 27112429302.

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 849684204 + ... + 849684227.

It is an arithmetic number, because the mean of its divisors is an integer number (3965193008).

Almost surely, 2^20392421172 is an apocalyptic number.

It is an amenable number.

20392421172 is an abundant number, since it is smaller than the sum of its proper divisors (27189894924).

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

20392421172 is a wasteful number, since it uses less digits than its factorization.

20392421172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1699368438 (or 1699368436 counting only the distinct ones).

The product of its (nonzero) digits is 12096, while the sum is 33.

The spelling of 20392421172 in words is "twenty billion, three hundred ninety-two million, four hundred twenty-one thousand, one hundred seventy-two".