18897520 has 20 divisors (see below), whose sum is σ = 43936920. Its totient is φ = 7558976.

The previous prime is 18897517. The next prime is 18897547. The reversal of 18897520 is 2579881.

It is a tau number, because it is divible by the number of its divisors (20).

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 118030 + ... + 118189.

It is an arithmetic number, because the mean of its divisors is an integer number (2196846).

Almost surely, 2^18897520 is an apocalyptic number.

18897520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18897520 is an abundant number, since it is smaller than the sum of its proper divisors (25039400).

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

18897520 is a wasteful number, since it uses less digits than its factorization.

18897520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 236232 (or 236226 counting only the distinct ones).

The product of its (nonzero) digits is 40320, while the sum is 40.

The square root of 18897520 is about 4347.1277874017. The cubic root of 18897520 is about 266.3595492093.

It can be divided in two parts, 1889 and 7520, that added together give a square (9409 = 97²).

The spelling of 18897520 in words is "eighteen million, eight hundred ninety-seven thousand, five hundred twenty".