18441720 has 96 divisors (see below), whose sum is σ = 65398320. Its totient is φ = 4469760.

The previous prime is 18441697. The next prime is 18441727. The reversal of 18441720 is 2714481.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18441727) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1632 + ... + 6288.

Almost surely, 2^18441720 is an apocalyptic number.

18441720 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 18441720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32699160).

18441720 is an abundant number, since it is smaller than the sum of its proper divisors (46956600).

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

18441720 is a wasteful number, since it uses less digits than its factorization.

18441720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4685 (or 4678 counting only the distinct ones).

The product of its (nonzero) digits is 1792, while the sum is 27.

The square root of 18441720 is about 4294.3823770130. The cubic root of 18441720 is about 264.2006051038.

The spelling of 18441720 in words is "eighteen million, four hundred forty-one thousand, seven hundred twenty".