20408375172 has 24 divisors (see below), whose sum is σ = 47660520096. Its totient is φ = 6796937728.

The previous prime is 20408375167. The next prime is 20408375213. The reversal of 20408375172 is 27157380402.

It is a super-2 number, since 2×20408375172² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 20408375172.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 717213 + ... + 745124.

It is an arithmetic number, because the mean of its divisors is an integer number (1985855004).

Almost surely, 2^20408375172 is an apocalyptic number.

It is an amenable number.

20408375172 is an abundant number, since it is smaller than the sum of its proper divisors (27252144924).

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

20408375172 is a wasteful number, since it uses less digits than its factorization.

20408375172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1463507 (or 1463505 counting only the distinct ones).

The product of its (nonzero) digits is 94080, while the sum is 39.

The spelling of 20408375172 in words is "twenty billion, four hundred eight million, three hundred seventy-five thousand, one hundred seventy-two".