20344664624521 has 8 divisors (see below), whose sum is σ = 21576322757160. Its totient is φ = 19116885731328.

The previous prime is 20344664624503. The next prime is 20344664624533. The reversal of 20344664624521 is 12542646644302.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 926144468496 + 19418520156025 = 962364^2 + 4406645^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20344664624521 - 2²⁵ = 20344631070089 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20344664624561) 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, 969799056 + ... + 969820033.

It is an arithmetic number, because the mean of its divisors is an integer number (2697040344645).

Almost surely, 2^{20344664624521} is an apocalyptic number.

It is an amenable number.

20344664624521 is a deficient number, since it is larger than the sum of its proper divisors (1231658132639).

20344664624521 is a wasteful number, since it uses less digits than its factorization.

20344664624521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1939619723.

The product of its (nonzero) digits is 6635520, while the sum is 49.

The spelling of 20344664624521 in words is "twenty trillion, three hundred forty-four billion, six hundred sixty-four million, six hundred twenty-four thousand, five hundred twenty-one".