20508755238 has 48 divisors (see below), whose sum is σ = 45357966576. Its totient is φ = 6694833600.

The previous prime is 20508755237. The next prime is 20508755251. The reversal of 20508755238 is 83255780502.

20508755238 is a `hidden beast` number, since 2 + 0 + 50 + 8 + 75 + 523 + 8 = 666.

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 20508755193 and 20508755202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20508755231) 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, 502188 + ... + 541488.

It is an arithmetic number, because the mean of its divisors is an integer number (944957637).

Almost surely, 2^20508755238 is an apocalyptic number.

20508755238 is an abundant number, since it is smaller than the sum of its proper divisors (24849211338).

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

20508755238 is a wasteful number, since it uses less digits than its factorization.

20508755238 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39909 (or 39906 counting only the distinct ones).

The product of its (nonzero) digits is 672000, while the sum is 45.

The spelling of 20508755238 in words is "twenty billion, five hundred eight million, seven hundred fifty-five thousand, two hundred thirty-eight".