20826806447 has 2 divisors, whose sum is σ = 20826806448. Its totient is φ = 20826806446.

The previous prime is 20826806417. The next prime is 20826806459. The reversal of 20826806447 is 74460862802.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20826806447 - 2⁸ = 20826806191 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20826806417) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10413403223 + 10413403224.

It is an arithmetic number, because the mean of its divisors is an integer number (10413403224).

Almost surely, 2^20826806447 is an apocalyptic number.

20826806447 is a deficient number, since it is larger than the sum of its proper divisors (1).

20826806447 is an equidigital number, since it uses as much as digits as its factorization.

20826806447 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1032192, while the sum is 47.

The spelling of 20826806447 in words is "twenty billion, eight hundred twenty-six million, eight hundred six thousand, four hundred forty-seven".