20302453 has 4 divisors (see below), whose sum is σ = 20391340. Its totient is φ = 20213568.

The previous prime is 20302417. The next prime is 20302459. The reversal of 20302453 is 35420302.

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 15816529 + 4485924 = 3977^2 + 2118^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20302453 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20302453.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20302459) 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, 44100 + ... + 44557.

It is an arithmetic number, because the mean of its divisors is an integer number (5097835).

Almost surely, 2^20302453 is an apocalyptic number.

It is an amenable number.

20302453 is a deficient number, since it is larger than the sum of its proper divisors (88887).

20302453 is an equidigital number, since it uses as much as digits as its factorization.

20302453 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 88886.

The product of its (nonzero) digits is 720, while the sum is 19.

The square root of 20302453 is about 4505.8243418935. The cubic root of 20302453 is about 272.8032278107.

Adding to 20302453 its reverse (35420302), we get a palindrome (55722755).

The spelling of 20302453 in words is "twenty million, three hundred two thousand, four hundred fifty-three".