20621344613723 has 24 divisors (see below), whose sum is σ = 24018219952704. Its totient is φ = 17653249026000.

The previous prime is 20621344613711. The next prime is 20621344613747. The reversal of 20621344613723 is 32731644312602.

It is not a de Polignac number, because 20621344613723 - 2⁴ = 20621344613707 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20621344603723) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 221243336 + ... + 221336522.

It is an arithmetic number, because the mean of its divisors is an integer number (1000759164696).

Almost surely, 2^{20621344613723} is an apocalyptic number.

20621344613723 is a deficient number, since it is larger than the sum of its proper divisors (3396875338981).

20621344613723 is an equidigital number, since it uses as much as digits as its factorization.

20621344613723 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 98823 (or 98816 counting only the distinct ones).

The product of its (nonzero) digits is 870912, while the sum is 44.

The spelling of 20621344613723 in words is "twenty trillion, six hundred twenty-one billion, three hundred forty-four million, six hundred thirteen thousand, seven hundred twenty-three".