20722245641 has 4 divisors (see below), whose sum is σ = 21282306372. Its totient is φ = 20162184912.

The previous prime is 20722245637. The next prime is 20722245673. The reversal of 20722245641 is 14654222702.

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

It can be written as a sum of positive squares in 2 ways, for example, as 19966820416 + 755425225 = 141304^2 + 27485^2 .

It is a cyclic number.

It is not a de Polignac number, because 20722245641 - 2² = 20722245637 is a prime.

It is a super-2 number, since 2×20722245641² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20722245041) 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, 280030310 + ... + 280030383.

It is an arithmetic number, because the mean of its divisors is an integer number (5320576593).

Almost surely, 2^20722245641 is an apocalyptic number.

It is an amenable number.

20722245641 is a deficient number, since it is larger than the sum of its proper divisors (560060731).

20722245641 is an equidigital number, since it uses as much as digits as its factorization.

20722245641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 560060730.

The product of its (nonzero) digits is 53760, while the sum is 35.

The spelling of 20722245641 in words is "twenty billion, seven hundred twenty-two million, two hundred forty-five thousand, six hundred forty-one".