20370506809 has 2 divisors, whose sum is σ = 20370506810. Its totient is φ = 20370506808.

The previous prime is 20370506777. The next prime is 20370506903. The reversal of 20370506809 is 90860507302.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19762736400 + 607770409 = 140580^2 + 24653^2 .

It is a cyclic number.

It is not a de Polignac number, because 20370506809 - 2⁵ = 20370506777 is a prime.

It is not a weakly prime, because it can be changed into another prime (20370506609) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10185253404 + 10185253405.

It is an arithmetic number, because the mean of its divisors is an integer number (10185253405).

Almost surely, 2^20370506809 is an apocalyptic number.

It is an amenable number.

20370506809 is a deficient number, since it is larger than the sum of its proper divisors (1).

20370506809 is an equidigital number, since it uses as much as digits as its factorization.

20370506809 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 90720, while the sum is 40.

The spelling of 20370506809 in words is "twenty billion, three hundred seventy million, five hundred six thousand, eight hundred nine".