20404453 has 2 divisors, whose sum is σ = 20404454. Its totient is φ = 20404452.

The previous prime is 20404441. The next prime is 20404469. The reversal of 20404453 is 35440402.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12659364 + 7745089 = 3558^2 + 2783^2 .

It is a cyclic number.

It is not a de Polignac number, because 20404453 - 2⁵ = 20404421 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20404493) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10202226 + 10202227.

It is an arithmetic number, because the mean of its divisors is an integer number (10202227).

Almost surely, 2^20404453 is an apocalyptic number.

It is an amenable number.

20404453 is a deficient number, since it is larger than the sum of its proper divisors (1).

20404453 is an equidigital number, since it uses as much as digits as its factorization.

20404453 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1920, while the sum is 22.

The square root of 20404453 is about 4517.1288447420. The cubic root of 20404453 is about 273.2593214577.

Adding to 20404453 its reverse (35440402), we get a palindrome (55844855).

The spelling of 20404453 in words is "twenty million, four hundred four thousand, four hundred fifty-three".