20089755821 has 2 divisors, whose sum is σ = 20089755822. Its totient is φ = 20089755820.

The previous prime is 20089755817. The next prime is 20089755877. The reversal of 20089755821 is 12855798002.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17517846025 + 2571909796 = 132355^2 + 50714^2 .

It is a cyclic number.

It is not a de Polignac number, because 20089755821 - 2² = 20089755817 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20089755121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10044877910 + 10044877911.

It is an arithmetic number, because the mean of its divisors is an integer number (10044877911).

Almost surely, 2^20089755821 is an apocalyptic number.

It is an amenable number.

20089755821 is a deficient number, since it is larger than the sum of its proper divisors (1).

20089755821 is an equidigital number, since it uses as much as digits as its factorization.

20089755821 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 403200, while the sum is 47.

The spelling of 20089755821 in words is "twenty billion, eighty-nine million, seven hundred fifty-five thousand, eight hundred twenty-one".