18061920 has 192 divisors, whose sum is σ = 65499840. Its totient is φ = 4644864.

The previous prime is 18061919. The next prime is 18061937. The reversal of 18061920 is 2916081.

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 31 ways as a sum of consecutive naturals, for example, 159784 + ... + 159896.

It is an arithmetic number, because the mean of its divisors is an integer number (341145).

Almost surely, 2^18061920 is an apocalyptic number.

18061920 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 18061920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32749920).

18061920 is an abundant number, since it is smaller than the sum of its proper divisors (47437920).

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

18061920 is a wasteful number, since it uses less digits than its factorization.

18061920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 174 (or 160 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 27.

The square root of 18061920 is about 4249.9317641581. The cubic root of 18061920 is about 262.3743071711.

It can be divided in two parts, 18061 and 920, that added together give a palindrome (18981).

The spelling of 18061920 in words is "eighteen million, sixty-one thousand, nine hundred twenty".