20826923189 has 2 divisors, whose sum is σ = 20826923190. Its totient is φ = 20826923188.

The previous prime is 20826923137. The next prime is 20826923203. The reversal of 20826923189 is 98132962802.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15502740100 + 5324183089 = 124510^2 + 72967^2 .

It is a cyclic number.

It is not a de Polignac number, because 20826923189 - 2¹² = 20826919093 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20826923119) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10413461594 + 10413461595.

It is an arithmetic number, because the mean of its divisors is an integer number (10413461595).

Almost surely, 2^20826923189 is an apocalyptic number.

It is an amenable number.

20826923189 is a deficient number, since it is larger than the sum of its proper divisors (1).

20826923189 is an equidigital number, since it uses as much as digits as its factorization.

20826923189 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 746496, while the sum is 50.

The spelling of 20826923189 in words is "twenty billion, eight hundred twenty-six million, nine hundred twenty-three thousand, one hundred eighty-nine".