20413218 has 64 divisors (see below), whose sum is σ = 48660480. Its totient is φ = 5588352.

The previous prime is 20413199. The next prime is 20413219. The reversal of 20413218 is 81231402.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a junction number, because it is equal to n+sod(n) for n = 20413194 and 20413203.

It is not an unprimeable number, because it can be changed into a prime (20413219) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 160671 + ... + 160797.

It is an arithmetic number, because the mean of its divisors is an integer number (760320).

Almost surely, 2^20413218 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20413218, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24330240).

20413218 is an abundant number, since it is smaller than the sum of its proper divisors (28247262).

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

20413218 is a wasteful number, since it uses less digits than its factorization.

20413218 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 271.

The product of its (nonzero) digits is 384, while the sum is 21.

The square root of 20413218 is about 4518.0989364997. The cubic root of 20413218 is about 273.2984432298.

The spelling of 20413218 in words is "twenty million, four hundred thirteen thousand, two hundred eighteen".