20720618075645 has 8 divisors (see below), whose sum is σ = 25179485256960. Its totient is φ = 16366665416400.

The previous prime is 20720618075621. The next prime is 20720618075657. The reversal of 20720618075645 is 54657081602702.

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

It is not a de Polignac number, because 20720618075645 - 2²⁴ = 20720601298429 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 26228630081 + ... + 26228630870.

It is an arithmetic number, because the mean of its divisors is an integer number (3147435657120).

Almost surely, 2^{20720618075645} is an apocalyptic number.

It is an amenable number.

20720618075645 is a deficient number, since it is larger than the sum of its proper divisors (4458867181315).

20720618075645 is an equidigital number, since it uses as much as digits as its factorization.

20720618075645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52457261035.

The product of its (nonzero) digits is 5644800, while the sum is 53.

The spelling of 20720618075645 in words is "twenty trillion, seven hundred twenty billion, six hundred eighteen million, seventy-five thousand, six hundred forty-five".