20812968389 has 2 divisors, whose sum is σ = 20812968390. Its totient is φ = 20812968388.

The previous prime is 20812968377. The next prime is 20812968469. The reversal of 20812968389 is 98386921802.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12738508225 + 8074460164 = 112865^2 + 89858^2 .

It is a cyclic number.

It is not a de Polignac number, because 20812968389 - 2²⁰ = 20811919813 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20812968359) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10406484194 + 10406484195.

It is an arithmetic number, because the mean of its divisors is an integer number (10406484195).

Almost surely, 2^20812968389 is an apocalyptic number.

It is an amenable number.

20812968389 is a deficient number, since it is larger than the sum of its proper divisors (1).

20812968389 is an equidigital number, since it uses as much as digits as its factorization.

20812968389 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2985984, while the sum is 56.

The spelling of 20812968389 in words is "twenty billion, eight hundred twelve million, nine hundred sixty-eight thousand, three hundred eighty-nine".