20495218 has 8 divisors (see below), whose sum is σ = 30777948. Its totient is φ = 10235904.

The previous prime is 20495213. The next prime is 20495221. The reversal of 20495218 is 81259402.

It can be written as a sum of positive squares in 2 ways, for example, as 19386409 + 1108809 = 4403^2 + 1053^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 20495218.

It is not an unprimeable number, because it can be changed into a prime (20495213) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3471 + ... + 7282.

Almost surely, 2^20495218 is an apocalyptic number.

20495218 is a deficient number, since it is larger than the sum of its proper divisors (10282730).

20495218 is a wasteful number, since it uses less digits than its factorization.

20495218 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11708.

The product of its (nonzero) digits is 5760, while the sum is 31.

The square root of 20495218 is about 4527.1644547111. The cubic root of 20495218 is about 273.6639013932.

The spelling of 20495218 in words is "twenty million, four hundred ninety-five thousand, two hundred eighteen".