20602397653 has 2 divisors, whose sum is σ = 20602397654. Its totient is φ = 20602397652.

The previous prime is 20602397611. The next prime is 20602397657. The reversal of 20602397653 is 35679320602.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18095092324 + 2507305329 = 134518^2 + 50073^2 .

It is a cyclic number.

It is not a de Polignac number, because 20602397653 - 2⁹ = 20602397141 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20602397657) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10301198826 + 10301198827.

It is an arithmetic number, because the mean of its divisors is an integer number (10301198827).

Almost surely, 2^20602397653 is an apocalyptic number.

It is an amenable number.

20602397653 is a deficient number, since it is larger than the sum of its proper divisors (1).

20602397653 is an equidigital number, since it uses as much as digits as its factorization.

20602397653 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 408240, while the sum is 43.

The spelling of 20602397653 in words is "twenty billion, six hundred two million, three hundred ninety-seven thousand, six hundred fifty-three".