20422590721 has 16 divisors (see below), whose sum is σ = 22959095040. Its totient is φ = 18024684480.

The previous prime is 20422590703. The next prime is 20422590731. The reversal of 20422590721 is 12709522402.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 20422590721 - 2¹⁷ = 20422459649 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20422590731) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 807100 + ... + 832018.

It is an arithmetic number, because the mean of its divisors is an integer number (1434943440).

Almost surely, 2^20422590721 is an apocalyptic number.

It is an amenable number.

20422590721 is a deficient number, since it is larger than the sum of its proper divisors (2536504319).

20422590721 is a wasteful number, since it uses less digits than its factorization.

20422590721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27696.

The product of its (nonzero) digits is 20160, while the sum is 34.

The spelling of 20422590721 in words is "twenty billion, four hundred twenty-two million, five hundred ninety thousand, seven hundred twenty-one".