20525918393 has 2 divisors, whose sum is σ = 20525918394. Its totient is φ = 20525918392.

The previous prime is 20525918389. The next prime is 20525918407. The reversal of 20525918393 is 39381952502.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12762898729 + 7763019664 = 112973^2 + 88108^2 .

It is a cyclic number.

It is not a de Polignac number, because 20525918393 - 2² = 20525918389 is a prime.

It is a super-3 number, since 3×20525918393³ (a number of 32 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (20525918353) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10262959196 + 10262959197.

It is an arithmetic number, because the mean of its divisors is an integer number (10262959197).

Almost surely, 2^20525918393 is an apocalyptic number.

It is an amenable number.

20525918393 is a deficient number, since it is larger than the sum of its proper divisors (1).

20525918393 is an equidigital number, since it uses as much as digits as its factorization.

20525918393 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 583200, while the sum is 47.

The spelling of 20525918393 in words is "twenty billion, five hundred twenty-five million, nine hundred eighteen thousand, three hundred ninety-three".