20538556038 has 384 divisors, whose sum is σ = 61993451520. Its totient is φ = 4743048960.

The previous prime is 20538556013. The next prime is 20538556067. The reversal of 20538556038 is 83065583502.

20538556038 is a `hidden beast` number, since 2 + 0 + 5 + 3 + 85 + 560 + 3 + 8 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 20538555984 and 20538556002.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 66900681 + ... + 66900987.

It is an arithmetic number, because the mean of its divisors is an integer number (161441280).

Almost surely, 2^20538556038 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20538556038, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30996725760).

20538556038 is an abundant number, since it is smaller than the sum of its proper divisors (41454895482).

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

20538556038 is a wasteful number, since it uses less digits than its factorization.

20538556038 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 472 (or 469 counting only the distinct ones).

The product of its (nonzero) digits is 864000, while the sum is 45.

The spelling of 20538556038 in words is "twenty billion, five hundred thirty-eight million, five hundred fifty-six thousand, thirty-eight".