20536391069 has 2 divisors, whose sum is σ = 20536391070. Its totient is φ = 20536391068.

The previous prime is 20536391023. The next prime is 20536391107. The reversal of 20536391069 is 96019363502.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11404104100 + 9132286969 = 106790^2 + 95563^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20536391069 is a prime.

It is a super-2 number, since 2×20536391069² (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 (20536391669) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10268195534 + 10268195535.

It is an arithmetic number, because the mean of its divisors is an integer number (10268195535).

Almost surely, 2^20536391069 is an apocalyptic number.

It is an amenable number.

20536391069 is a deficient number, since it is larger than the sum of its proper divisors (1).

20536391069 is an equidigital number, since it uses as much as digits as its factorization.

20536391069 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 262440, while the sum is 44.

The spelling of 20536391069 in words is "twenty billion, five hundred thirty-six million, three hundred ninety-one thousand, sixty-nine".