20943359999 has 4 divisors (see below), whose sum is σ = 20946264360. Its totient is φ = 20940455640.

The previous prime is 20943359993. The next prime is 20943360007. The reversal of 20943359999 is 99995334902.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 99995334902 = 2 ⋅49997667451.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20943359999 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20943359993) 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, 1441337 + ... + 1455794.

It is an arithmetic number, because the mean of its divisors is an integer number (5236566090).

Almost surely, 2^20943359999 is an apocalyptic number.

20943359999 is a deficient number, since it is larger than the sum of its proper divisors (2904361).

20943359999 is an equidigital number, since it uses as much as digits as its factorization.

20943359999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2904360.

The product of its (nonzero) digits is 21257640, while the sum is 62.

The spelling of 20943359999 in words is "twenty billion, nine hundred forty-three million, three hundred fifty-nine thousand, nine hundred ninety-nine".