20001440139 has 16 divisors (see below), whose sum is σ = 27236399904. Its totient is φ = 13051584000.

The previous prime is 20001440111. The next prime is 20001440143. The reversal of 20001440139 is 93104410002.

It is not a de Polignac number, because 20001440139 - 2²⁷ = 19867222411 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20001440189) 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, 82462 + ... + 216339.

It is an arithmetic number, because the mean of its divisors is an integer number (1702274994).

Almost surely, 2^20001440139 is an apocalyptic number.

20001440139 is a deficient number, since it is larger than the sum of its proper divisors (7234959765).

20001440139 is a wasteful number, since it uses less digits than its factorization.

20001440139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 299278.

The product of its (nonzero) digits is 864, while the sum is 24.

The spelling of 20001440139 in words is "twenty billion, one million, four hundred forty thousand, one hundred thirty-nine".