20239351938 has 48 divisors (see below), whose sum is σ = 50003114616. Its totient is φ = 5861168640.

The previous prime is 20239351903. The next prime is 20239351939. The reversal of 20239351938 is 83915393202.

20239351938 is a `hidden beast` number, since 20 + 23 + 93 + 519 + 3 + 8 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 19452717729 + 786634209 = 139473^2 + 28047^2 .

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 20239351893 and 20239351902.

It is not an unprimeable number, because it can be changed into a prime (20239351939) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2539933 + ... + 2547888.

Almost surely, 2^20239351938 is an apocalyptic number.

20239351938 is an abundant number, since it is smaller than the sum of its proper divisors (29763762678).

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

20239351938 is a wasteful number, since it uses less digits than its factorization.

20239351938 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5087859 (or 5087856 counting only the distinct ones).

The product of its (nonzero) digits is 349920, while the sum is 45.

The spelling of 20239351938 in words is "twenty billion, two hundred thirty-nine million, three hundred fifty-one thousand, nine hundred thirty-eight".