18535220 has 48 divisors (see below), whose sum is σ = 42795648. Its totient is φ = 6687360.

The previous prime is 18535199. The next prime is 18535243. The reversal of 18535220 is 2253581.

It is a self number, because there is not a number n which added to its sum of digits gives 18535220.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 37817 + ... + 38303.

It is an arithmetic number, because the mean of its divisors is an integer number (891576).

Almost surely, 2^18535220 is an apocalyptic number.

18535220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18535220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21397824).

18535220 is an abundant number, since it is smaller than the sum of its proper divisors (24260428).

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

18535220 is a wasteful number, since it uses less digits than its factorization.

18535220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 680 (or 678 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 26.

The square root of 18535220 is about 4305.2549285728. The cubic root of 18535220 is about 264.6463539439.

The spelling of 18535220 in words is "eighteen million, five hundred thirty-five thousand, two hundred twenty".