20656322065 has 16 divisors (see below), whose sum is σ = 24902280000. Its totient is φ = 16448772672.

The previous prime is 20656322041. The next prime is 20656322087. The reversal of 20656322065 is 56022365602.

It is a cyclic number.

It is not a de Polignac number, because 20656322065 - 2⁵ = 20656322033 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 959914 + ... + 981196.

It is an arithmetic number, because the mean of its divisors is an integer number (1556392500).

Almost surely, 2^20656322065 is an apocalyptic number.

It is an amenable number.

20656322065 is a deficient number, since it is larger than the sum of its proper divisors (4245957935).

20656322065 is a wasteful number, since it uses less digits than its factorization.

20656322065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22176.

The product of its (nonzero) digits is 129600, while the sum is 37.

Adding to 20656322065 its reverse (56022365602), we get a palindrome (76678687667).

The spelling of 20656322065 in words is "twenty billion, six hundred fifty-six million, three hundred twenty-two thousand, sixty-five".