20218537366722 has 16 divisors (see below), whose sum is σ = 44930083037280. Its totient is φ = 6739512455556.

The previous prime is 20218537366721. The next prime is 20218537366733. The reversal of 20218537366722 is 22766373581202.

20218537366722 is a `hidden beast` number, since 2 + 0 + 2 + 1 + 8 + 537 + 36 + 6 + 72 + 2 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54), and also a Moran number because the ratio is a prime number: 374417358643 = 20218537366722 / (2 + 0 + 2 + 1 + 8 + 5 + 3 + 7 + 3 + 6 + 6 + 7 + 2 + 2).

It is not an unprimeable number, because it can be changed into a prime (20218537366721) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 187208679268 + ... + 187208679375.

It is an arithmetic number, because the mean of its divisors is an integer number (2808130189830).

Almost surely, 2^{20218537366722} is an apocalyptic number.

20218537366722 is an abundant number, since it is smaller than the sum of its proper divisors (24711545670558).

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

20218537366722 is a wasteful number, since it uses less digits than its factorization.

20218537366722 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 374417358654 (or 374417358648 counting only the distinct ones).

The product of its (nonzero) digits is 10160640, while the sum is 54.

The spelling of 20218537366722 in words is "twenty trillion, two hundred eighteen billion, five hundred thirty-seven million, three hundred sixty-six thousand, seven hundred twenty-two".