20918298999 has 32 divisors (see below), whose sum is σ = 30372018880. Its totient is φ = 12729249792.

The previous prime is 20918298997. The next prime is 20918299001. The reversal of 20918298999 is 99989281902.

It is an interprime number because it is at equal distance from previous prime (20918298997) and next prime (20918299001).

It is not a de Polignac number, because 20918298999 - 2¹ = 20918298997 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 (20918298997) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 8582409 + ... + 8584845.

It is an arithmetic number, because the mean of its divisors is an integer number (949125590).

Almost surely, 2^20918298999 is an apocalyptic number.

20918298999 is a deficient number, since it is larger than the sum of its proper divisors (9453719881).

20918298999 is a wasteful number, since it uses less digits than its factorization.

20918298999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4819.

The product of its (nonzero) digits is 15116544, while the sum is 66.

The spelling of 20918298999 in words is "twenty billion, nine hundred eighteen million, two hundred ninety-eight thousand, nine hundred ninety-nine".