18949520 has 20 divisors (see below), whose sum is σ = 44057820. Its totient is φ = 7579776.

The previous prime is 18949487. The next prime is 18949523. The reversal of 18949520 is 2594981.

It can be written as a sum of positive squares in 2 ways, for example, as 9634816 + 9314704 = 3104^2 + 3052^2 .

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

It is not an unprimeable number, because it can be changed into a prime (18949523) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 118355 + ... + 118514.

It is an arithmetic number, because the mean of its divisors is an integer number (2202891).

Almost surely, 2^18949520 is an apocalyptic number.

18949520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18949520 is an abundant number, since it is smaller than the sum of its proper divisors (25108300).

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

18949520 is a wasteful number, since it uses less digits than its factorization.

18949520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 236882 (or 236876 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 38.

The square root of 18949520 is about 4353.1046392202. The cubic root of 18949520 is about 266.6036378816.

The spelling of 18949520 in words is "eighteen million, nine hundred forty-nine thousand, five hundred twenty".