20135453 has 4 divisors (see below), whose sum is σ = 21684348. Its totient is φ = 18586560.

The previous prime is 20135447. The next prime is 20135501. The reversal of 20135453 is 35453102.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 9721924 + 10413529 = 3118^2 + 3227^2 .

It is a cyclic number.

It is not a de Polignac number, because 20135453 - 2⁸ = 20135197 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20138453) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 774428 + ... + 774453.

It is an arithmetic number, because the mean of its divisors is an integer number (5421087).

Almost surely, 2^20135453 is an apocalyptic number.

It is an amenable number.

20135453 is a deficient number, since it is larger than the sum of its proper divisors (1548895).

20135453 is a wasteful number, since it uses less digits than its factorization.

20135453 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1548894.

The product of its (nonzero) digits is 1800, while the sum is 23.

The square root of 20135453 is about 4487.2545058198. The cubic root of 20135453 is about 272.0531767787.

Adding to 20135453 its reverse (35453102), we get a palindrome (55588555).

The spelling of 20135453 in words is "twenty million, one hundred thirty-five thousand, four hundred fifty-three".