18836820 has 48 divisors (see below), whose sum is σ = 58605120. Its totient is φ = 5023008.

The previous prime is 18836819. The next prime is 18836821. The reversal of 18836820 is 2863881.

It is an interprime number because it is at equal distance from previous prime (18836819) and next prime (18836821).

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18836821) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16902 + ... + 17981.

It is an arithmetic number, because the mean of its divisors is an integer number (1220940).

Almost surely, 2^18836820 is an apocalyptic number.

18836820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18836820 is an abundant number, since it is smaller than the sum of its proper divisors (39768300).

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

18836820 is a wasteful number, since it uses less digits than its factorization.

18836820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34901 (or 34893 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 36.

The square root of 18836820 is about 4340.1405507195. The cubic root of 18836820 is about 266.0740555486.

The spelling of 18836820 in words is "eighteen million, eight hundred thirty-six thousand, eight hundred twenty".