20008426649 has 2 divisors, whose sum is σ = 20008426650. Its totient is φ = 20008426648.

The previous prime is 20008426631. The next prime is 20008426703. The reversal of 20008426649 is 94662480002.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13324546624 + 6683880025 = 115432^2 + 81755^2 .

It is a cyclic number.

It is not a de Polignac number, because 20008426649 - 2⁸ = 20008426393 is a prime.

It is not a weakly prime, because it can be changed into another prime (20008426609) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10004213324 + 10004213325.

It is an arithmetic number, because the mean of its divisors is an integer number (10004213325).

Almost surely, 2^20008426649 is an apocalyptic number.

It is an amenable number.

20008426649 is a deficient number, since it is larger than the sum of its proper divisors (1).

20008426649 is an equidigital number, since it uses as much as digits as its factorization.

20008426649 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 165888, while the sum is 41.

The spelling of 20008426649 in words is "twenty billion, eight million, four hundred twenty-six thousand, six hundred forty-nine".