20420453 has 2 divisors, whose sum is σ = 20420454. Its totient is φ = 20420452.

The previous prime is 20420443. The next prime is 20420479. The reversal of 20420453 is 35402402.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16507969 + 3912484 = 4063^2 + 1978^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20420453 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20420443) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10210226 + 10210227.

It is an arithmetic number, because the mean of its divisors is an integer number (10210227).

Almost surely, 2^20420453 is an apocalyptic number.

It is an amenable number.

20420453 is a deficient number, since it is larger than the sum of its proper divisors (1).

20420453 is an equidigital number, since it uses as much as digits as its factorization.

20420453 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 960, while the sum is 20.

The square root of 20420453 is about 4518.8995341786. The cubic root of 20420453 is about 273.3307275513.

Adding to 20420453 its reverse (35402402), we get a palindrome (55822855).

The spelling of 20420453 in words is "twenty million, four hundred twenty thousand, four hundred fifty-three".