18520552 has 8 divisors (see below), whose sum is σ = 34726050. Its totient is φ = 9260272.

The previous prime is 18520493. The next prime is 18520553. The reversal of 18520552 is 25502581.

It can be written as a sum of positive squares in only one way, i.e., 11519236 + 7001316 = 3394^2 + 2646^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a hoax number, since the sum of its digits (28) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 18520552.

It is not an unprimeable number, because it can be changed into a prime (18520553) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1157527 + ... + 1157542.

Almost surely, 2^18520552 is an apocalyptic number.

It is an amenable number.

18520552 is a deficient number, since it is larger than the sum of its proper divisors (16205498).

18520552 is a wasteful number, since it uses less digits than its factorization.

18520552 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2315075 (or 2315071 counting only the distinct ones).

The product of its (nonzero) digits is 4000, while the sum is 28.

The square root of 18520552 is about 4303.5510918310. The cubic root of 18520552 is about 264.5765254922.

The spelling of 18520552 in words is "eighteen million, five hundred twenty thousand, five hundred fifty-two".