20712199 has 2 divisors, whose sum is σ = 20712200. Its totient is φ = 20712198.

The previous prime is 20712187. The next prime is 20712221. The reversal of 20712199 is 99121702.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20712199 - 2⁹ = 20711687 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20712199.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20712499) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10356099 + 10356100.

It is an arithmetic number, because the mean of its divisors is an integer number (10356100).

Almost surely, 2^20712199 is an apocalyptic number.

20712199 is a deficient number, since it is larger than the sum of its proper divisors (1).

20712199 is an equidigital number, since it uses as much as digits as its factorization.

20712199 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2268, while the sum is 31.

The square root of 20712199 is about 4551.0656993720. The cubic root of 20712199 is about 274.6262647618.

The spelling of 20712199 in words is "twenty million, seven hundred twelve thousand, one hundred ninety-nine".