20453504 has 16 divisors (see below), whose sum is σ = 40747470. Its totient is φ = 10226688.

The previous prime is 20453501. The next prime is 20453527. The reversal of 20453504 is 40535402.

It can be written as a sum of positive squares in only one way, i.e., 20430400 + 23104 = 4520^2 + 152^2 .

It is a tau number, because it is divible by the number of its divisors (16).

It is a self number, because there is not a number n which added to its sum of digits gives 20453504.

It is not an unprimeable number, because it can be changed into a prime (20453501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 79769 + ... + 80024.

Almost surely, 2^20453504 is an apocalyptic number.

It is an amenable number.

20453504 is a deficient number, since it is larger than the sum of its proper divisors (20293966).

20453504 is an equidigital number, since it uses as much as digits as its factorization.

20453504 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 159807 (or 159795 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 23.

The square root of 20453504 is about 4522.5550300687. Note that the first 3 decimals coincide. The cubic root of 20453504 is about 273.4781122089.

Adding to 20453504 its reverse (40535402), we get a palindrome (60988906).

The spelling of 20453504 in words is "twenty million, four hundred fifty-three thousand, five hundred four".