20464218 has 16 divisors (see below), whose sum is σ = 45476160. Its totient is φ = 6821388.

The previous prime is 20464217. The next prime is 20464229. The reversal of 20464218 is 81246402.

20464218 is a `hidden beast` number, since 2 + 0 + 4 + 642 + 18 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a junction number, because it is equal to n+sod(n) for n = 20464191 and 20464200.

It is not an unprimeable number, because it can be changed into a prime (20464211) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 189430 + ... + 189537.

It is an arithmetic number, because the mean of its divisors is an integer number (2842260).

Almost surely, 2^20464218 is an apocalyptic number.

20464218 is an abundant number, since it is smaller than the sum of its proper divisors (25011942).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20464218 is a wasteful number, since it uses less digits than its factorization.

20464218 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 378978 (or 378972 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 27.

The square root of 20464218 is about 4523.7393824136. The cubic root of 20464218 is about 273.5258551781.

The spelling of 20464218 in words is "twenty million, four hundred sixty-four thousand, two hundred eighteen".