20602397209 has 2 divisors, whose sum is σ = 20602397210. Its totient is φ = 20602397208.

The previous prime is 20602397191. The next prime is 20602397273. The reversal of 20602397209 is 90279320602.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20285735184 + 316662025 = 142428^2 + 17795^2 .

It is a cyclic number.

It is not a de Polignac number, because 20602397209 - 2⁹ = 20602396697 is a prime.

It is not a weakly prime, because it can be changed into another prime (20602397909) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10301198604 + 10301198605.

It is an arithmetic number, because the mean of its divisors is an integer number (10301198605).

Almost surely, 2^20602397209 is an apocalyptic number.

It is an amenable number.

20602397209 is a deficient number, since it is larger than the sum of its proper divisors (1).

20602397209 is an equidigital number, since it uses as much as digits as its factorization.

20602397209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 81648, while the sum is 40.

The spelling of 20602397209 in words is "twenty billion, six hundred two million, three hundred ninety-seven thousand, two hundred nine".