20205601397 has 2 divisors, whose sum is σ = 20205601398. Its totient is φ = 20205601396.

The previous prime is 20205601331. The next prime is 20205601441. The reversal of 20205601397 is 79310650202.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15073455076 + 5132146321 = 122774^2 + 71639^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20205601397 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20205691397) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10102800698 + 10102800699.

It is an arithmetic number, because the mean of its divisors is an integer number (10102800699).

Almost surely, 2^20205601397 is an apocalyptic number.

It is an amenable number.

20205601397 is a deficient number, since it is larger than the sum of its proper divisors (1).

20205601397 is an equidigital number, since it uses as much as digits as its factorization.

20205601397 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 22680, while the sum is 35.

The spelling of 20205601397 in words is "twenty billion, two hundred five million, six hundred one thousand, three hundred ninety-seven".