20420002345637 has 2 divisors, whose sum is σ = 20420002345638. Its totient is φ = 20420002345636.

The previous prime is 20420002345609. The next prime is 20420002345669. The reversal of 20420002345637 is 73654320002402.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10488264396481 + 9931737949156 = 3238559^2 + 3151466^2 .

It is a cyclic number.

It is not a de Polignac number, because 20420002345637 - 2⁸ = 20420002345381 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20420002345637.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20420002345607) 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, 10210001172818 + 10210001172819.

It is an arithmetic number, because the mean of its divisors is an integer number (10210001172819).

Almost surely, 2^{20420002345637} is an apocalyptic number.

It is an amenable number.

20420002345637 is a deficient number, since it is larger than the sum of its proper divisors (1).

20420002345637 is an equidigital number, since it uses as much as digits as its factorization.

20420002345637 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 241920, while the sum is 38.

The spelling of 20420002345637 in words is "twenty trillion, four hundred twenty billion, two million, three hundred forty-five thousand, six hundred thirty-seven".