20553453 has 24 divisors (see below), whose sum is σ = 31149440. Its totient is φ = 13394160.

The previous prime is 20553451. The next prime is 20553461. The reversal of 20553453 is 35435502.

20553453 is a `hidden beast` number, since 205 + 5 + 3 + 453 = 666.

It is not a de Polignac number, because 20553453 - 2¹ = 20553451 is a prime.

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

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20553451) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 75708 + ... + 75978.

Almost surely, 2^20553453 is an apocalyptic number.

It is an amenable number.

20553453 is a deficient number, since it is larger than the sum of its proper divisors (10595987).

20553453 is an equidigital number, since it uses as much as digits as its factorization.

20553453 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 386 (or 327 counting only the distinct ones).

The product of its (nonzero) digits is 9000, while the sum is 27.

The square root of 20553453 is about 4533.5916225439. The cubic root of 20553453 is about 273.9228519903.

Adding to 20553453 its reverse (35435502), we get a palindrome (55988955).

The spelling of 20553453 in words is "twenty million, five hundred fifty-three thousand, four hundred fifty-three".