20478532279 has 2 divisors, whose sum is σ = 20478532280. Its totient is φ = 20478532278.

The previous prime is 20478532199. The next prime is 20478532301. The reversal of 20478532279 is 97223587402.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20478532279 - 2⁹ = 20478531767 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20478530279) 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, 10239266139 + 10239266140.

It is an arithmetic number, because the mean of its divisors is an integer number (10239266140).

Almost surely, 2^20478532279 is an apocalyptic number.

20478532279 is a deficient number, since it is larger than the sum of its proper divisors (1).

20478532279 is an equidigital number, since it uses as much as digits as its factorization.

20478532279 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1693440, while the sum is 49.

The spelling of 20478532279 in words is "twenty billion, four hundred seventy-eight million, five hundred thirty-two thousand, two hundred seventy-nine".