20842453 has 2 divisors, whose sum is σ = 20842454. Its totient is φ = 20842452.

The previous prime is 20842441. The next prime is 20842483. The reversal of 20842453 is 35424802.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17825284 + 3017169 = 4222^2 + 1737^2 .

It is a cyclic number.

It is not a de Polignac number, because 20842453 - 2⁵ = 20842421 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20842483) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10421226 + 10421227.

It is an arithmetic number, because the mean of its divisors is an integer number (10421227).

Almost surely, 2^20842453 is an apocalyptic number.

It is an amenable number.

20842453 is a deficient number, since it is larger than the sum of its proper divisors (1).

20842453 is an equidigital number, since it uses as much as digits as its factorization.

20842453 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7680, while the sum is 28.

The square root of 20842453 is about 4565.3535460028. The cubic root of 20842453 is about 275.2007481853.

The spelling of 20842453 in words is "twenty million, eight hundred forty-two thousand, four hundred fifty-three".