20456573496981 has 16 divisors (see below), whose sum is σ = 28801551288000. Its totient is φ = 12879184232448.

The previous prime is 20456573496979. The next prime is 20456573496991. The reversal of 20456573496981 is 18969437565402.

It is not a de Polignac number, because 20456573496981 - 2¹ = 20456573496979 is a prime.

It is a super-2 number, since 2×20456573496981² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20456573496991) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 566050156 + ... + 566086293.

It is an arithmetic number, because the mean of its divisors is an integer number (1800096955500).

It is a 1-persistent number, because it is pandigital, but 2⋅20456573496981 = 40913146993962 is not.

Almost surely, 2^{20456573496981} is an apocalyptic number.

It is an amenable number.

20456573496981 is a deficient number, since it is larger than the sum of its proper divisors (8344977791019).

20456573496981 is a wasteful number, since it uses less digits than its factorization.

20456573496981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1132136788.

The product of its (nonzero) digits is 391910400, while the sum is 69.

The spelling of 20456573496981 in words is "twenty trillion, four hundred fifty-six billion, five hundred seventy-three million, four hundred ninety-six thousand, nine hundred eighty-one".