20001243399 has 16 divisors (see below), whose sum is σ = 28079606400. Its totient is φ = 12628905696.

The previous prime is 20001243391. The next prime is 20001243473. The reversal of 20001243399 is 99334210002.

It is not a de Polignac number, because 20001243399 - 2³ = 20001243391 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20001243391) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 170637 + ... + 262905.

It is an arithmetic number, because the mean of its divisors is an integer number (1754975400).

Almost surely, 2^20001243399 is an apocalyptic number.

20001243399 is a deficient number, since it is larger than the sum of its proper divisors (8078363001).

20001243399 is a wasteful number, since it uses less digits than its factorization.

20001243399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 96094.

The product of its (nonzero) digits is 11664, while the sum is 33.

The spelling of 20001243399 in words is "twenty billion, one million, two hundred forty-three thousand, three hundred ninety-nine".