22720408388 has 6 divisors (see below), whose sum is σ = 39760714686. Its totient is φ = 11360204192.

The previous prime is 22720408363. The next prime is 22720408409. The reversal of 22720408388 is 88380402722.

It can be written as a sum of positive squares in only one way, i.e., 12846408964 + 9873999424 = 113342^2 + 99368^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2840051045 + ... + 2840051052.

It is an arithmetic number, because the mean of its divisors is an integer number (6626785781).

Almost surely, 2^22720408388 is an apocalyptic number.

It is an amenable number.

22720408388 is a deficient number, since it is larger than the sum of its proper divisors (17040306298).

22720408388 is a wasteful number, since it uses less digits than its factorization.

22720408388 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5680102101 (or 5680102099 counting only the distinct ones).

The product of its (nonzero) digits is 344064, while the sum is 44.

The spelling of 22720408388 in words is "twenty-two billion, seven hundred twenty million, four hundred eight thousand, three hundred eighty-eight".