20538667021998 has 32 divisors (see below), whose sum is σ = 43241885850240. Its totient is φ = 6485506820640.

The previous prime is 20538667021987. The next prime is 20538667022023. The reversal of 20538667021998 is 89912076683502.

It is a Smith number, since the sum of its digits (66) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3472440 + ... + 7289387.

It is an arithmetic number, because the mean of its divisors is an integer number (1351308932820).

Almost surely, 2^{20538667021998} is an apocalyptic number.

20538667021998 is an abundant number, since it is smaller than the sum of its proper divisors (22703218828242).

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

20538667021998 is a wasteful number, since it uses less digits than its factorization.

20538667021998 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10778592.

The product of its (nonzero) digits is 78382080, while the sum is 66.

The spelling of 20538667021998 in words is "twenty trillion, five hundred thirty-eight billion, six hundred sixty-seven million, twenty-one thousand, nine hundred ninety-eight".