20445453 has 40 divisors (see below), whose sum is σ = 35335872. Its totient is φ = 11539584.

The previous prime is 20445443. The next prime is 20445487. The reversal of 20445453 is 35454402.

20445453 is a `hidden beast` number, since 204 + 4 + 5 + 453 = 666.

It is not a de Polignac number, because 20445453 - 2¹⁰ = 20444429 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20445443) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 60501 + ... + 60837.

Almost surely, 2^20445453 is an apocalyptic number.

It is an amenable number.

20445453 is a deficient number, since it is larger than the sum of its proper divisors (14890419).

20445453 is a wasteful number, since it uses less digits than its factorization.

20445453 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 463 (or 454 counting only the distinct ones).

The product of its (nonzero) digits is 9600, while the sum is 27.

The square root of 20445453 is about 4521.6648482611. The cubic root of 20445453 is about 273.4422249393.

Adding to 20445453 its reverse (35454402), we get a palindrome (55899855).

The spelling of 20445453 in words is "twenty million, four hundred forty-five thousand, four hundred fifty-three".