20606647231 has 2 divisors, whose sum is σ = 20606647232. Its totient is φ = 20606647230.

The previous prime is 20606647153. The next prime is 20606647337. The reversal of 20606647231 is 13274660602.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20606647231 is a prime.

It is a super-2 number, since 2×20606647231² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20606647931) 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, 10303323615 + 10303323616.

It is an arithmetic number, because the mean of its divisors is an integer number (10303323616).

Almost surely, 2^20606647231 is an apocalyptic number.

20606647231 is a deficient number, since it is larger than the sum of its proper divisors (1).

20606647231 is an equidigital number, since it uses as much as digits as its factorization.

20606647231 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 72576, while the sum is 37.

The spelling of 20606647231 in words is "twenty billion, six hundred six million, six hundred forty-seven thousand, two hundred thirty-one".