20218799 has 2 divisors, whose sum is σ = 20218800. Its totient is φ = 20218798.

The previous prime is 20218787. The next prime is 20218819. The reversal of 20218799 is 99781202.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20218799 - 2²⁰ = 19170223 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20212799) 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 as a sum of consecutive naturals, namely, 10109399 + 10109400.

It is an arithmetic number, because the mean of its divisors is an integer number (10109400).

Almost surely, 2^20218799 is an apocalyptic number.

20218799 is a deficient number, since it is larger than the sum of its proper divisors (1).

20218799 is an equidigital number, since it uses as much as digits as its factorization.

20218799 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 18144, while the sum is 38.

The square root of 20218799 is about 4496.5318857982. The cubic root of 20218799 is about 272.4280268916.

The spelling of 20218799 in words is "twenty million, two hundred eighteen thousand, seven hundred ninety-nine".