18361620 has 96 divisors (see below), whose sum is σ = 58732800. Its totient is φ = 4758912.

The previous prime is 18361601. The next prime is 18361627. The reversal of 18361620 is 2616381.

18361620 = T₇₅ + T₇₆ + ... + T₄₇₉.

18361620 is a `hidden beast` number, since 1 + 8 + 36 + 1 + 620 = 666.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18361627) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 19521 + ... + 20439.

It is an arithmetic number, because the mean of its divisors is an integer number (611800).

Almost surely, 2^18361620 is an apocalyptic number.

18361620 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 18361620, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29366400).

18361620 is an abundant number, since it is smaller than the sum of its proper divisors (40371180).

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

18361620 is a wasteful number, since it uses less digits than its factorization.

18361620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 974 (or 966 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 27.

The square root of 18361620 is about 4285.0460907673. The cubic root of 18361620 is about 263.8175392125.

It can be divided in two parts, 18361 and 620, that added together give a palindrome (18981).

The spelling of 18361620 in words is "eighteen million, three hundred sixty-one thousand, six hundred twenty".