20826613 has 2 divisors, whose sum is σ = 20826614. Its totient is φ = 20826612.

The previous prime is 20826601. The next prime is 20826629. The reversal of 20826613 is 31662802.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16834609 + 3992004 = 4103^2 + 1998^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20826613 is a prime.

It is equal to p_1319680 and since 20826613 and 1319680 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20826653) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10413306 + 10413307.

It is an arithmetic number, because the mean of its divisors is an integer number (10413307).

Almost surely, 2^20826613 is an apocalyptic number.

It is an amenable number.

20826613 is a deficient number, since it is larger than the sum of its proper divisors (1).

20826613 is an equidigital number, since it uses as much as digits as its factorization.

20826613 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3456, while the sum is 28.

The square root of 20826613 is about 4563.6184108665. The cubic root of 20826613 is about 275.1310141570.

The spelling of 20826613 in words is "twenty million, eight hundred twenty-six thousand, six hundred thirteen".