18964220 has 24 divisors (see below), whose sum is σ = 43445808. Its totient is φ = 6896000.

The previous prime is 18964189. The next prime is 18964237. The reversal of 18964220 is 2246981.

It is a congruent number.

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, 42881 + ... + 43320.

It is an arithmetic number, because the mean of its divisors is an integer number (1810242).

Almost surely, 2^18964220 is an apocalyptic number.

18964220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18964220 is an abundant number, since it is smaller than the sum of its proper divisors (24481588).

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

18964220 is a wasteful number, since it uses less digits than its factorization.

18964220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86221 (or 86219 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 32.

The square root of 18964220 is about 4354.7927620037. The cubic root of 18964220 is about 266.6725588976.

It can be divided in two parts, 1896 and 4220, that added together give a palindrome (6116).

The spelling of 18964220 in words is "eighteen million, nine hundred sixty-four thousand, two hundred twenty".