20648722051 has 4 divisors (see below), whose sum is σ = 20651087704. Its totient is φ = 20646356400.

The previous prime is 20648722033. The next prime is 20648722099. The reversal of 20648722051 is 15022784602.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20648722051 - 2²⁵ = 20615167619 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20648722051.

It is not an unprimeable number, because it can be changed into a prime (20648722951) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1169685 + ... + 1187206.

It is an arithmetic number, because the mean of its divisors is an integer number (5162771926).

Almost surely, 2^20648722051 is an apocalyptic number.

20648722051 is a deficient number, since it is larger than the sum of its proper divisors (2365653).

20648722051 is an equidigital number, since it uses as much as digits as its factorization.

20648722051 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2365652.

The product of its (nonzero) digits is 53760, while the sum is 37.

The spelling of 20648722051 in words is "twenty billion, six hundred forty-eight million, seven hundred twenty-two thousand, fifty-one".