20899211 has 2 divisors, whose sum is σ = 20899212. Its totient is φ = 20899210.

The previous prime is 20899201. The next prime is 20899231. The reversal of 20899211 is 11299802.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20899211 - 2²² = 16704907 is a prime.

It is not a weakly prime, because it can be changed into another prime (20899201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10449605 + 10449606.

It is an arithmetic number, because the mean of its divisors is an integer number (10449606).

Almost surely, 2^20899211 is an apocalyptic number.

20899211 is a deficient number, since it is larger than the sum of its proper divisors (1).

20899211 is an equidigital number, since it uses as much as digits as its factorization.

20899211 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 20899211 is about 4571.5654867890. The cubic root of 20899211 is about 275.4503299223.

The spelling of 20899211 in words is "twenty million, eight hundred ninety-nine thousand, two hundred eleven".