18953720 has 32 divisors (see below), whose sum is σ = 43236720. Its totient is φ = 7476480.

The previous prime is 18953719. The next prime is 18953723. The reversal of 18953720 is 2735981.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18953723) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 326 + ... + 6165.

Almost surely, 2^18953720 is an apocalyptic number.

18953720 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 18953720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21618360).

18953720 is an abundant number, since it is smaller than the sum of its proper divisors (24283000).

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

18953720 is a wasteful number, since it uses less digits than its factorization.

18953720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6575 (or 6571 counting only the distinct ones).

The product of its (nonzero) digits is 15120, while the sum is 35.

The square root of 18953720 is about 4353.5870268090. The cubic root of 18953720 is about 266.6233332365.

The spelling of 18953720 in words is "eighteen million, nine hundred fifty-three thousand, seven hundred twenty".