20657143279 has 2 divisors, whose sum is σ = 20657143280. Its totient is φ = 20657143278.

The previous prime is 20657143261. The next prime is 20657143321. The reversal of 20657143279 is 97234175602.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20657143279 - 2²¹ = 20655046127 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20657143219) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10328571639 + 10328571640.

It is an arithmetic number, because the mean of its divisors is an integer number (10328571640).

Almost surely, 2^20657143279 is an apocalyptic number.

20657143279 is a deficient number, since it is larger than the sum of its proper divisors (1).

20657143279 is an equidigital number, since it uses as much as digits as its factorization.

20657143279 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 635040, while the sum is 46.

The spelling of 20657143279 in words is "twenty billion, six hundred fifty-seven million, one hundred forty-three thousand, two hundred seventy-nine".