20722453 has 2 divisors, whose sum is σ = 20722454. Its totient is φ = 20722452.

The previous prime is 20722451. The next prime is 20722519. The reversal of 20722453 is 35422702.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12096484 + 8625969 = 3478^2 + 2937^2 .

It is a cyclic number.

It is not a de Polignac number, because 20722453 - 2¹ = 20722451 is a prime.

Together with 20722451, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20722451) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10361226 + 10361227.

It is an arithmetic number, because the mean of its divisors is an integer number (10361227).

Almost surely, 2^20722453 is an apocalyptic number.

It is an amenable number.

20722453 is a deficient number, since it is larger than the sum of its proper divisors (1).

20722453 is an equidigital number, since it uses as much as digits as its factorization.

20722453 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3360, while the sum is 25.

The square root of 20722453 is about 4552.1921093029. The cubic root of 20722453 is about 274.6715770781.

The spelling of 20722453 in words is "twenty million, seven hundred twenty-two thousand, four hundred fifty-three".