20002221138 has 32 divisors (see below), whose sum is σ = 40623208704. Its totient is φ = 6564385872.

The previous prime is 20002221137. The next prime is 20002221143. The reversal of 20002221138 is 83112220002.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (20002221133) 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, 802581 + ... + 827127.

It is an arithmetic number, because the mean of its divisors is an integer number (1269475272).

Almost surely, 2^20002221138 is an apocalyptic number.

20002221138 is an abundant number, since it is smaller than the sum of its proper divisors (20620987566).

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

20002221138 is a wasteful number, since it uses less digits than its factorization.

20002221138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26646.

The product of its (nonzero) digits is 384, while the sum is 21.

The spelling of 20002221138 in words is "twenty billion, two million, two hundred twenty-one thousand, one hundred thirty-eight".