18204948 has 18 divisors (see below), whose sum is σ = 46018154. Its totient is φ = 6068304.

The previous prime is 18204931. The next prime is 18205001. The reversal of 18204948 is 84940281.

It can be written as a sum of positive squares in only one way, i.e., 16793604 + 1411344 = 4098^2 + 1188^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 505693 = 18204948 / (1 + 8 + 2 + 0 + 4 + 9 + 4 + 8).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 252811 + ... + 252882.

Almost surely, 2^18204948 is an apocalyptic number.

18204948 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

18204948 is an abundant number, since it is smaller than the sum of its proper divisors (27813206).

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

18204948 is a wasteful number, since it uses less digits than its factorization.

18204948 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 505703 (or 505698 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 36.

The square root of 18204948 is about 4266.7256766753. The cubic root of 18204948 is about 263.0650467763.

The spelling of 18204948 in words is "eighteen million, two hundred four thousand, nine hundred forty-eight".