20516722172 has 12 divisors (see below), whose sum is σ = 36062433960. Its totient is φ = 10213169616.

The previous prime is 20516722123. The next prime is 20516722199. The reversal of 20516722172 is 27122761502.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11296847 + ... + 11298662.

It is an arithmetic number, because the mean of its divisors is an integer number (3005202830).

Almost surely, 2^20516722172 is an apocalyptic number.

It is an amenable number.

20516722172 is a deficient number, since it is larger than the sum of its proper divisors (15545711788).

20516722172 is a wasteful number, since it uses less digits than its factorization.

20516722172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22595740 (or 22595738 counting only the distinct ones).

The product of its (nonzero) digits is 23520, while the sum is 35.

The spelling of 20516722172 in words is "twenty billion, five hundred sixteen million, seven hundred twenty-two thousand, one hundred seventy-two".