20875647138 has 32 divisors (see below), whose sum is σ = 42735382272. Its totient is φ = 6794634000.

The previous prime is 20875647109. The next prime is 20875647139. The reversal of 20875647138 is 83174657802.

It is not an unprimeable number, because it can be changed into a prime (20875647139) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 983053 + ... + 1004063.

It is an arithmetic number, because the mean of its divisors is an integer number (1335480696).

Almost surely, 2^20875647138 is an apocalyptic number.

20875647138 is an abundant number, since it is smaller than the sum of its proper divisors (21859735134).

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

20875647138 is a wasteful number, since it uses less digits than its factorization.

20875647138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24910.

The product of its (nonzero) digits is 2257920, while the sum is 51.

The spelling of 20875647138 in words is "twenty billion, eight hundred seventy-five million, six hundred forty-seven thousand, one hundred thirty-eight".