20809004933 has 2 divisors, whose sum is σ = 20809004934. Its totient is φ = 20809004932.

The previous prime is 20809004891. The next prime is 20809004959. The reversal of 20809004933 is 33940090802.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20587084324 + 221920609 = 143482^2 + 14897^2 .

It is a cyclic number.

It is not a de Polignac number, because 20809004933 - 2⁸ = 20809004677 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20809004633) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10404502466 + 10404502467.

It is an arithmetic number, because the mean of its divisors is an integer number (10404502467).

Almost surely, 2^20809004933 is an apocalyptic number.

It is an amenable number.

20809004933 is a deficient number, since it is larger than the sum of its proper divisors (1).

20809004933 is an equidigital number, since it uses as much as digits as its factorization.

20809004933 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 46656, while the sum is 38.

The spelling of 20809004933 in words is "twenty billion, eight hundred nine million, four thousand, nine hundred thirty-three".