20281199 has 2 divisors, whose sum is σ = 20281200. Its totient is φ = 20281198.

The previous prime is 20281169. The next prime is 20281211. The reversal of 20281199 is 99118202.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20281199 is a prime.

It is a super-2 number, since 2×20281199² = 822654065755202, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20281159) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10140599 + 10140600.

It is an arithmetic number, because the mean of its divisors is an integer number (10140600).

Almost surely, 2^20281199 is an apocalyptic number.

20281199 is a deficient number, since it is larger than the sum of its proper divisors (1).

20281199 is an equidigital number, since it uses as much as digits as its factorization.

20281199 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2592, while the sum is 32.

The square root of 20281199 is about 4503.4652213601. The cubic root of 20281199 is about 272.7079981968.

The spelling of 20281199 in words is "twenty million, two hundred eighty-one thousand, one hundred ninety-nine".