18963220 has 24 divisors (see below), whose sum is σ = 40033224. Its totient is φ = 7545216.

The previous prime is 18963199. The next prime is 18963221. The reversal of 18963220 is 2236981.

It can be written as a sum of positive squares in 4 ways, for example, as 9253764 + 9709456 = 3042^2 + 3116^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18963221) 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, 1534 + ... + 6346.

It is an arithmetic number, because the mean of its divisors is an integer number (1668051).

Almost surely, 2^18963220 is an apocalyptic number.

18963220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18963220 is an abundant number, since it is smaller than the sum of its proper divisors (21070004).

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

18963220 is a wasteful number, since it uses less digits than its factorization.

18963220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5019 (or 5017 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 31.

The square root of 18963220 is about 4354.6779444639. The cubic root of 18963220 is about 266.6678715223.

The spelling of 18963220 in words is "eighteen million, nine hundred sixty-three thousand, two hundred twenty".