18145620 has 120 divisors (see below), whose sum is σ = 59520384. Its totient is φ = 4618944.

The previous prime is 18145529. The next prime is 18145637. The reversal of 18145620 is 2654181.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 37017 + ... + 37503.

Almost surely, 2^18145620 is an apocalyptic number.

18145620 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 18145620, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29760192).

18145620 is an abundant number, since it is smaller than the sum of its proper divisors (41374764).

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

18145620 is a wasteful number, since it uses less digits than its factorization.

18145620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 531 (or 520 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 27.

The square root of 18145620 is about 4259.7675992946. The cubic root of 18145620 is about 262.7789687304.

It can be divided in two parts, 181456 and 20, that added together give a square (181476 = 426²).

The spelling of 18145620 in words is "eighteen million, one hundred forty-five thousand, six hundred twenty".