20826797 has 2 divisors, whose sum is σ = 20826798. Its totient is φ = 20826796.

The previous prime is 20826791. The next prime is 20826809. The reversal of 20826797 is 79762802.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20620681 + 206116 = 4541^2 + 454^2 .

It is a cyclic number.

It is not a de Polignac number, because 20826797 - 2¹² = 20822701 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20826791) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10413398 + 10413399.

It is an arithmetic number, because the mean of its divisors is an integer number (10413399).

Almost surely, 2^20826797 is an apocalyptic number.

It is an amenable number.

20826797 is a deficient number, since it is larger than the sum of its proper divisors (1).

20826797 is an equidigital number, since it uses as much as digits as its factorization.

20826797 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 84672, while the sum is 41.

The square root of 20826797 is about 4563.6385702639. The cubic root of 20826797 is about 275.1318244017.

The spelling of 20826797 in words is "twenty million, eight hundred twenty-six thousand, seven hundred ninety-seven".