20443453 has 2 divisors, whose sum is σ = 20443454. Its totient is φ = 20443452.

The previous prime is 20443439. The next prime is 20443457. The reversal of 20443453 is 35434402.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10876804 + 9566649 = 3298^2 + 3093^2 .

It is a cyclic number.

It is not a de Polignac number, because 20443453 - 2²¹ = 18346301 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20443457) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10221726 + 10221727.

It is an arithmetic number, because the mean of its divisors is an integer number (10221727).

Almost surely, 2^20443453 is an apocalyptic number.

It is an amenable number.

20443453 is a deficient number, since it is larger than the sum of its proper divisors (1).

20443453 is an equidigital number, since it uses as much as digits as its factorization.

20443453 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5760, while the sum is 25.

The square root of 20443453 is about 4521.4436853731. The cubic root of 20443453 is about 273.4333084941.

Adding to 20443453 its reverse (35434402), we get a palindrome (55877855).

The spelling of 20443453 in words is "twenty million, four hundred forty-three thousand, four hundred fifty-three".