20208138722 has 6 divisors (see below), whose sum is σ = 30312509643. Its totient is φ = 10103968842.

The previous prime is 20208138673. The next prime is 20208138739. The reversal of 20208138722 is 22783180202.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 10104069361 + 10104069361 = 100519^2 + 100519^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=100519.

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, 150779 + ... + 251297.

Almost surely, 2^20208138722 is an apocalyptic number.

20208138722 is a deficient number, since it is larger than the sum of its proper divisors (10104370921).

20208138722 is an frugal number, since it uses more digits than its factorization.

20208138722 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 201040 (or 100521 counting only the distinct ones).

The product of its (nonzero) digits is 21504, while the sum is 35.

The spelling of 20208138722 in words is "twenty billion, two hundred eight million, one hundred thirty-eight thousand, seven hundred twenty-two".