20812967389 has 2 divisors, whose sum is σ = 20812967390. Its totient is φ = 20812967388.

The previous prime is 20812967363. The next prime is 20812967393. The reversal of 20812967389 is 98376921802.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20812967289 + 100 = 144267^2 + 10^2 .

It is a cyclic number.

It is not a de Polignac number, because 20812967389 - 2¹³ = 20812959197 is a prime.

It is a super-2 number, since 2×20812967389² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20812968389) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10406483694 + 10406483695.

It is an arithmetic number, because the mean of its divisors is an integer number (10406483695).

Almost surely, 2^20812967389 is an apocalyptic number.

It is an amenable number.

20812967389 is a deficient number, since it is larger than the sum of its proper divisors (1).

20812967389 is an equidigital number, since it uses as much as digits as its factorization.

20812967389 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2612736, while the sum is 55.

The spelling of 20812967389 in words is "twenty billion, eight hundred twelve million, nine hundred sixty-seven thousand, three hundred eighty-nine".