20164218372 has 18 divisors (see below), whose sum is σ = 50970663198. Its totient is φ = 6721406112.

The previous prime is 20164218353. The next prime is 20164218391. The reversal of 20164218372 is 27381246102.

It is a happy number.

20164218372 is a `hidden beast` number, since 2 + 0 + 1 + 642 + 1 + 8 + 3 + 7 + 2 = 666.

It is an interprime number because it is at equal distance from previous prime (20164218353) and next prime (20164218391).

It can be written as a sum of positive squares in only one way, i.e., 15942597696 + 4221620676 = 126264^2 + 64974^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 560117177 = 20164218372 / (2 + 0 + 1 + 6 + 4 + 2 + 1 + 8 + 3 + 7 + 2).

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 280058553 + ... + 280058624.

It is an arithmetic number, because the mean of its divisors is an integer number (2831703511).

Almost surely, 2^20164218372 is an apocalyptic number.

It is an amenable number.

20164218372 is an abundant number, since it is smaller than the sum of its proper divisors (30806444826).

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

20164218372 is a wasteful number, since it uses less digits than its factorization.

20164218372 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 560117187 (or 560117182 counting only the distinct ones).

The product of its (nonzero) digits is 32256, while the sum is 36.

The spelling of 20164218372 in words is "twenty billion, one hundred sixty-four million, two hundred eighteen thousand, three hundred seventy-two".