20651727407 has 2 divisors, whose sum is σ = 20651727408. Its totient is φ = 20651727406.

The previous prime is 20651727311. The next prime is 20651727413. The reversal of 20651727407 is 70472715602.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20651727407 - 2²² = 20647533103 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20651727907) 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, 10325863703 + 10325863704.

It is an arithmetic number, because the mean of its divisors is an integer number (10325863704).

Almost surely, 2^20651727407 is an apocalyptic number.

20651727407 is a deficient number, since it is larger than the sum of its proper divisors (1).

20651727407 is an equidigital number, since it uses as much as digits as its factorization.

20651727407 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 164640, while the sum is 41.

The spelling of 20651727407 in words is "twenty billion, six hundred fifty-one million, seven hundred twenty-seven thousand, four hundred seven".