18020512 has 48 divisors (see below), whose sum is σ = 37830240. Its totient is φ = 8425728.

The previous prime is 18020503. The next prime is 18020537. The reversal of 18020512 is 21502081.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is a self number, because there is not a number n which added to its sum of digits gives 18020512.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 64918 + ... + 65194.

It is an arithmetic number, because the mean of its divisors is an integer number (788130).

Almost surely, 2^18020512 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18020512, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (18915120).

18020512 is an abundant number, since it is smaller than the sum of its proper divisors (19809728).

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

18020512 is a wasteful number, since it uses less digits than its factorization.

18020512 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 413 (or 405 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 19.

The square root of 18020512 is about 4245.0573612143. The cubic root of 18020512 is about 262.1736509780.

Adding to 18020512 its reverse (21502081), we get a palindrome (39522593).

The spelling of 18020512 in words is "eighteen million, twenty thousand, five hundred twelve".