20019920867 has 2 divisors, whose sum is σ = 20019920868. Its totient is φ = 20019920866.

The previous prime is 20019920849. The next prime is 20019920909. The reversal of 20019920867 is 76802991002.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20019920867 - 2⁸ = 20019920611 is a prime.

It is not a weakly prime, because it can be changed into another prime (20019920827) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10009960433 + 10009960434.

It is an arithmetic number, because the mean of its divisors is an integer number (10009960434).

Almost surely, 2^20019920867 is an apocalyptic number.

20019920867 is a deficient number, since it is larger than the sum of its proper divisors (1).

20019920867 is an equidigital number, since it uses as much as digits as its factorization.

20019920867 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 108864, while the sum is 44.

The spelling of 20019920867 in words is "twenty billion, nineteen million, nine hundred twenty thousand, eight hundred sixty-seven".