20820649922 has 6 divisors (see below), whose sum is σ = 31231280979. Its totient is φ = 10410222930.

The previous prime is 20820649919. The next prime is 20820649937. The reversal of 20820649922 is 22994602802.

It can be written as a sum of positive squares in only one way, i.e., 10410324961 + 10410324961 = 102031^2 + 102031^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=102031.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 153047 + ... + 255077.

Almost surely, 2^20820649922 is an apocalyptic number.

20820649922 is a deficient number, since it is larger than the sum of its proper divisors (10410631057).

20820649922 is an frugal number, since it uses more digits than its factorization.

20820649922 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 204064 (or 102033 counting only the distinct ones).

The product of its (nonzero) digits is 248832, while the sum is 44.

The spelling of 20820649922 in words is "twenty billion, eight hundred twenty million, six hundred forty-nine thousand, nine hundred twenty-two".