18369820 has 24 divisors (see below), whose sum is σ = 44087904. Its totient is φ = 6298176.

The previous prime is 18369817. The next prime is 18369821. The reversal of 18369820 is 2896381.

It is a self number, because there is not a number n which added to its sum of digits gives 18369820.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18369821) 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, 65467 + ... + 65746.

It is an arithmetic number, because the mean of its divisors is an integer number (1836996).

Almost surely, 2^18369820 is an apocalyptic number.

18369820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18369820 is an abundant number, since it is smaller than the sum of its proper divisors (25718084).

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

18369820 is a wasteful number, since it uses less digits than its factorization.

18369820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 131229 (or 131227 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 37.

The square root of 18369820 is about 4286.0027998124. The cubic root of 18369820 is about 263.8568055711.

The spelling of 18369820 in words is "eighteen million, three hundred sixty-nine thousand, eight hundred twenty".