20031987842339 has 4 divisors (see below), whose sum is σ = 21853077646200. Its totient is φ = 18210898038480.

The previous prime is 20031987842329. The next prime is 20031987842351. The reversal of 20031987842339 is 93324878913002.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20031987842339 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20031987842329) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 910544901914 + ... + 910544901935.

It is an arithmetic number, because the mean of its divisors is an integer number (5463269411550).

Almost surely, 2^{20031987842339} is an apocalyptic number.

20031987842339 is a deficient number, since it is larger than the sum of its proper divisors (1821089803861).

20031987842339 is a wasteful number, since it uses less digits than its factorization.

20031987842339 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1821089803860.

The product of its (nonzero) digits is 15676416, while the sum is 59.

The spelling of 20031987842339 in words is "twenty trillion, thirty-one billion, nine hundred eighty-seven million, eight hundred forty-two thousand, three hundred thirty-nine".