20185002172 has 12 divisors (see below), whose sum is σ = 35336493360. Its totient is φ = 10088861216.

The previous prime is 20185002121. The next prime is 20185002181. The reversal of 20185002172 is 27120058102.

It is a self number, because there is not a number n which added to its sum of digits gives 20185002172.

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, 897472 + ... + 919687.

It is an arithmetic number, because the mean of its divisors is an integer number (2944707780).

Almost surely, 2^20185002172 is an apocalyptic number.

It is an amenable number.

20185002172 is a deficient number, since it is larger than the sum of its proper divisors (15151491188).

20185002172 is a wasteful number, since it uses less digits than its factorization.

20185002172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1819940 (or 1819938 counting only the distinct ones).

The product of its (nonzero) digits is 2240, while the sum is 28.

The spelling of 20185002172 in words is "twenty billion, one hundred eighty-five million, two thousand, one hundred seventy-two".