20470218 has 8 divisors (see below), whose sum is σ = 40940448. Its totient is φ = 6823404.

The previous prime is 20470217. The next prime is 20470237. The reversal of 20470218 is 81207402.

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

20470218 is an admirable number.

It is a Smith number, since the sum of its digits (24) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (20470217) 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, 1705846 + ... + 1705857.

It is an arithmetic number, because the mean of its divisors is an integer number (5117556).

Almost surely, 2^20470218 is an apocalyptic number.

20470218 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

20470218 is a wasteful number, since it uses less digits than its factorization.

20470218 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3411708.

The product of its (nonzero) digits is 896, while the sum is 24.

The square root of 20470218 is about 4524.4025019885. The cubic root of 20470218 is about 273.5525846752.

The spelling of 20470218 in words is "twenty million, four hundred seventy thousand, two hundred eighteen".