20012013138 has 64 divisors (see below), whose sum is σ = 43912028160. Its totient is φ = 6042883392.

The previous prime is 20012013089. The next prime is 20012013139. The reversal of 20012013138 is 83131021002.

It is not an unprimeable number, because it can be changed into a prime (20012013139) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1019331 + ... + 1038777.

It is an arithmetic number, because the mean of its divisors is an integer number (686125440).

Almost surely, 2^20012013138 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20012013138, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21956014080).

20012013138 is an abundant number, since it is smaller than the sum of its proper divisors (23900015022).

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

20012013138 is a wasteful number, since it uses less digits than its factorization.

20012013138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19711.

The product of its (nonzero) digits is 288, while the sum is 21.

The spelling of 20012013138 in words is "twenty billion, twelve million, thirteen thousand, one hundred thirty-eight".