20615351172 has 48 divisors (see below), whose sum is σ = 54849900672. Its totient is φ = 5970055680.

The previous prime is 20615351111. The next prime is 20615351201. The reversal of 20615351172 is 27115351602.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3884104 + ... + 3889407.

It is an arithmetic number, because the mean of its divisors is an integer number (1142706264).

Almost surely, 2^20615351172 is an apocalyptic number.

It is an amenable number.

20615351172 is an abundant number, since it is smaller than the sum of its proper divisors (34234549500).

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

20615351172 is a wasteful number, since it uses less digits than its factorization.

20615351172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7773548 (or 7773546 counting only the distinct ones).

The product of its (nonzero) digits is 12600, while the sum is 33.

The spelling of 20615351172 in words is "twenty billion, six hundred fifteen million, three hundred fifty-one thousand, one hundred seventy-two".