20874273647 has 2 divisors, whose sum is σ = 20874273648. Its totient is φ = 20874273646.

The previous prime is 20874273643. The next prime is 20874273733. The reversal of 20874273647 is 74637247802.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20874273647 - 2² = 20874273643 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20874273595 and 20874273604.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20874273643) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10437136823 + 10437136824.

It is an arithmetic number, because the mean of its divisors is an integer number (10437136824).

Almost surely, 2^20874273647 is an apocalyptic number.

20874273647 is a deficient number, since it is larger than the sum of its proper divisors (1).

20874273647 is an equidigital number, since it uses as much as digits as its factorization.

20874273647 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3161088, while the sum is 50.

The spelling of 20874273647 in words is "twenty billion, eight hundred seventy-four million, two hundred seventy-three thousand, six hundred forty-seven".