20922259 has 4 divisors (see below), whose sum is σ = 21432600. Its totient is φ = 20411920.

The previous prime is 20922199. The next prime is 20922269. The reversal of 20922259 is 95222902.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20922259 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20922259.

It is not an unprimeable number, because it can be changed into a prime (20922269) 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 in 3 ways as a sum of consecutive naturals, for example, 255109 + ... + 255190.

It is an arithmetic number, because the mean of its divisors is an integer number (5358150).

Almost surely, 2^20922259 is an apocalyptic number.

20922259 is a deficient number, since it is larger than the sum of its proper divisors (510341).

20922259 is an equidigital number, since it uses as much as digits as its factorization.

20922259 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 510340.

The product of its (nonzero) digits is 6480, while the sum is 31.

The square root of 20922259 is about 4574.0855916784. The cubic root of 20922259 is about 275.5515498018.

The spelling of 20922259 in words is "twenty million, nine hundred twenty-two thousand, two hundred fifty-nine".