20578547172 has 12 divisors (see below), whose sum is σ = 48016610096. Its totient is φ = 6859515720.

The previous prime is 20578547167. The next prime is 20578547237. The reversal of 20578547172 is 27174587502.

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

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, 857439454 + ... + 857439477.

Almost surely, 2^20578547172 is an apocalyptic number.

It is an amenable number.

20578547172 is an abundant number, since it is smaller than the sum of its proper divisors (27438062924).

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

20578547172 is a wasteful number, since it uses less digits than its factorization.

20578547172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1714878938 (or 1714878936 counting only the distinct ones).

The product of its (nonzero) digits is 1097600, while the sum is 48.

The spelling of 20578547172 in words is "twenty billion, five hundred seventy-eight million, five hundred forty-seven thousand, one hundred seventy-two".