20726597 has 2 divisors, whose sum is σ = 20726598. Its totient is φ = 20726596.

The previous prime is 20726581. The next prime is 20726599. The reversal of 20726597 is 79562702.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10797796 + 9928801 = 3286^2 + 3151^2 .

It is a cyclic number.

It is not a de Polignac number, because 20726597 - 2⁴ = 20726581 is a prime.

Together with 20726599, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20726597.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20726599) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10363298 + 10363299.

It is an arithmetic number, because the mean of its divisors is an integer number (10363299).

Almost surely, 2^20726597 is an apocalyptic number.

It is an amenable number.

20726597 is a deficient number, since it is larger than the sum of its proper divisors (1).

20726597 is an equidigital number, since it uses as much as digits as its factorization.

20726597 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 52920, while the sum is 38.

The square root of 20726597 is about 4552.6472518745. The cubic root of 20726597 is about 274.6898851286.

The spelling of 20726597 in words is "twenty million, seven hundred twenty-six thousand, five hundred ninety-seven".