20102218 has 8 divisors (see below), whose sum is σ = 30888900. Its totient is φ = 9805920.

The previous prime is 20102213. The next prime is 20102219. The reversal of 20102218 is 81220102.

It can be written as a sum of positive squares in 2 ways, for example, as 14085009 + 6017209 = 3753^2 + 2453^2 .

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

It is not an unprimeable number, because it can be changed into a prime (20102213) 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, 122493 + ... + 122656.

Almost surely, 2^20102218 is an apocalyptic number.

20102218 is a deficient number, since it is larger than the sum of its proper divisors (10786682).

20102218 is a wasteful number, since it uses less digits than its factorization.

20102218 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 245192.

The product of its (nonzero) digits is 64, while the sum is 16.

The square root of 20102218 is about 4483.5497097724. The cubic root of 20102218 is about 271.9034132986.

The spelling of 20102218 in words is "twenty million, one hundred two thousand, two hundred eighteen".