18860220 has 36 divisors (see below), whose sum is σ = 57209880. Its totient is φ = 5029344.

The previous prime is 18860213. The next prime is 18860221. The reversal of 18860220 is 2206881.

It is a tau number, because it is divible by the number of its divisors (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18860221) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 52210 + ... + 52569.

Almost surely, 2^18860220 is an apocalyptic number.

18860220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18860220 is an abundant number, since it is smaller than the sum of its proper divisors (38349660).

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

18860220 is a wasteful number, since it uses less digits than its factorization.

18860220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 104794 (or 104789 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 27.

The square root of 18860220 is about 4342.8354792693. The cubic root of 18860220 is about 266.1841866030.

The spelling of 18860220 in words is "eighteen million, eight hundred sixty thousand, two hundred twenty".