20661172696 has 32 divisors (see below), whose sum is σ = 38918880000. Its totient is φ = 10282871200.

The previous prime is 20661172643. The next prime is 20661172703. The reversal of 20661172696 is 69627116602.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3150621 + ... + 3157171.

It is an arithmetic number, because the mean of its divisors is an integer number (1216215000).

Almost surely, 2^20661172696 is an apocalyptic number.

It is an amenable number.

20661172696 is a deficient number, since it is larger than the sum of its proper divisors (18257707304).

20661172696 is a wasteful number, since it uses less digits than its factorization.

20661172696 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8319 (or 8315 counting only the distinct ones).

The product of its (nonzero) digits is 326592, while the sum is 46.

The spelling of 20661172696 in words is "twenty billion, six hundred sixty-one million, one hundred seventy-two thousand, six hundred ninety-six".