20383743138 has 32 divisors (see below), whose sum is σ = 47089719360. Its totient is φ = 5813544960.

The previous prime is 20383743137. The next prime is 20383743151. The reversal of 20383743138 is 83134738302.

It is a self number, because there is not a number n which added to its sum of digits gives 20383743138.

It is not an unprimeable number, because it can be changed into a prime (20383743137) 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, 9082543 + ... + 9084786.

It is an arithmetic number, because the mean of its divisors is an integer number (1471553730).

Almost surely, 2^20383743138 is an apocalyptic number.

20383743138 is an abundant number, since it is smaller than the sum of its proper divisors (26705976222).

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

20383743138 is a wasteful number, since it uses less digits than its factorization.

20383743138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18167362.

The product of its (nonzero) digits is 290304, while the sum is 42.

The spelling of 20383743138 in words is "twenty billion, three hundred eighty-three million, seven hundred forty-three thousand, one hundred thirty-eight".