18520002 has 48 divisors (see below), whose sum is σ = 42456960. Its totient is φ = 6048432.

The previous prime is 18520001. The next prime is 18520031. The reversal of 18520002 is 20002581.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (18520001) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 25399 + ... + 26117.

It is an arithmetic number, because the mean of its divisors is an integer number (884520).

Almost surely, 2^18520002 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18520002, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21228480).

18520002 is an abundant number, since it is smaller than the sum of its proper divisors (23936958).

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

18520002 is an equidigital number, since it uses as much as digits as its factorization.

18520002 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 789 (or 777 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 18.

The square root of 18520002 is about 4303.4871906397. The cubic root of 18520002 is about 264.5739064463.

Adding to 18520002 its reverse (20002581), we get a palindrome (38522583).

The spelling of 18520002 in words is "eighteen million, five hundred twenty thousand, two".