20718743922 has 90 divisors (see below), whose sum is σ = 47711510847. Its totient is φ = 6719988744.

The previous prime is 20718743921. The next prime is 20718743953. The reversal of 20718743922 is 22934781702.

20718743922 is a `hidden beast` number, since 207 + 1 + 8 + 7 + 439 + 2 + 2 = 666.

It can be written as a sum of positive squares in only one way, i.e., 10359371961 + 10359371961 = 101781^2 + 101781^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=101781.

It is not an unprimeable number, because it can be changed into a prime (20718743921) by changing a digit.

It is a polite number, since it can be written in 44 ways as a sum of consecutive naturals, for example, 78778363 + ... + 78778625.

Almost surely, 2^20718743922 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20718743922

20718743922 is an abundant number, since it is smaller than the sum of its proper divisors (26992766925).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20718743922 is an frugal number, since it uses more digits than its factorization.

20718743922 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 626 (or 311 counting only the distinct ones).

The product of its (nonzero) digits is 338688, while the sum is 45.

The spelling of 20718743922 in words is "twenty billion, seven hundred eighteen million, seven hundred forty-three thousand, nine hundred twenty-two".