20862229 has 4 divisors (see below), whose sum is σ = 20896876. Its totient is φ = 20827584.

The previous prime is 20862221. The next prime is 20862239. The reversal of 20862229 is 92226802.

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

It can be written as a sum of positive squares in 2 ways, for example, as 5299204 + 15563025 = 2302^2 + 3945^2 .

It is a cyclic number.

It is not a de Polignac number, because 20862229 - 2³ = 20862221 is a prime.

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 20862229.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20862221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16404 + ... + 17629.

It is an arithmetic number, because the mean of its divisors is an integer number (5224219).

Almost surely, 2^20862229 is an apocalyptic number.

It is an amenable number.

20862229 is a deficient number, since it is larger than the sum of its proper divisors (34647).

20862229 is an equidigital number, since it uses as much as digits as its factorization.

20862229 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34646.

The product of its (nonzero) digits is 6912, while the sum is 31.

The square root of 20862229 is about 4567.5189107436. The cubic root of 20862229 is about 275.2877604899.

The spelling of 20862229 in words is "twenty million, eight hundred sixty-two thousand, two hundred twenty-nine".