20722199 has 2 divisors, whose sum is σ = 20722200. Its totient is φ = 20722198.

The previous prime is 20722189. The next prime is 20722237. The reversal of 20722199 is 99122702.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20722199 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 (20722129) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10361099 + 10361100.

It is an arithmetic number, because the mean of its divisors is an integer number (10361100).

Almost surely, 2^20722199 is an apocalyptic number.

20722199 is a deficient number, since it is larger than the sum of its proper divisors (1).

20722199 is an equidigital number, since it uses as much as digits as its factorization.

20722199 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4536, while the sum is 32.

The square root of 20722199 is about 4552.1642105706. The cubic root of 20722199 is about 274.6704548354.

The spelling of 20722199 in words is "twenty million, seven hundred twenty-two thousand, one hundred ninety-nine".