20182220 has 24 divisors (see below), whose sum is σ = 42547344. Its totient is φ = 8041536.

The previous prime is 20182219. The next prime is 20182249. The reversal of 20182220 is 2228102.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3719 + ... + 7361.

It is an arithmetic number, because the mean of its divisors is an integer number (1772806).

Almost surely, 2^20182220 is an apocalyptic number.

20182220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20182220 is an abundant number, since it is smaller than the sum of its proper divisors (22365124).

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

20182220 is a wasteful number, since it uses less digits than its factorization.

20182220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3929 (or 3927 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 17.

The square root of 20182220 is about 4492.4625763605. The cubic root of 20182220 is about 272.2636392781.

It can be divided in two parts, 20182 and 220, that added together give a palindrome (20402).

The spelling of 20182220 in words is "twenty million, one hundred eighty-two thousand, two hundred twenty".