20497212653 has 2 divisors, whose sum is σ = 20497212654. Its totient is φ = 20497212652.

The previous prime is 20497212623. The next prime is 20497212721. The reversal of 20497212653 is 35621279402.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17924389924 + 2572822729 = 133882^2 + 50723^2 .

It is a cyclic number.

It is not a de Polignac number, because 20497212653 - 2³² = 16202245357 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20497212653.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20497212623) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10248606326 + 10248606327.

It is an arithmetic number, because the mean of its divisors is an integer number (10248606327).

Almost surely, 2^20497212653 is an apocalyptic number.

It is an amenable number.

20497212653 is a deficient number, since it is larger than the sum of its proper divisors (1).

20497212653 is an equidigital number, since it uses as much as digits as its factorization.

20497212653 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 181440, while the sum is 41.

The spelling of 20497212653 in words is "twenty billion, four hundred ninety-seven million, two hundred twelve thousand, six hundred fifty-three".