20893975829 has 2 divisors, whose sum is σ = 20893975830. Its totient is φ = 20893975828.

The previous prime is 20893975763. The next prime is 20893975849. The reversal of 20893975829 is 92857939802.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12443402500 + 8450573329 = 111550^2 + 91927^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20893975829 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 (20893975849) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10446987914 + 10446987915.

It is an arithmetic number, because the mean of its divisors is an integer number (10446987915).

Almost surely, 2^20893975829 is an apocalyptic number.

It is an amenable number.

20893975829 is a deficient number, since it is larger than the sum of its proper divisors (1).

20893975829 is an equidigital number, since it uses as much as digits as its factorization.

20893975829 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 19595520, while the sum is 62.

The spelling of 20893975829 in words is "twenty billion, eight hundred ninety-three million, nine hundred seventy-five thousand, eight hundred twenty-nine".