20397792479 has 2 divisors, whose sum is σ = 20397792480. Its totient is φ = 20397792478.

The previous prime is 20397792469. The next prime is 20397792511. The reversal of 20397792479 is 97429779302.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20397792479 - 2³² = 16102825183 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20397792469) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10198896239 + 10198896240.

It is an arithmetic number, because the mean of its divisors is an integer number (10198896240).

Almost surely, 2^20397792479 is an apocalyptic number.

20397792479 is a deficient number, since it is larger than the sum of its proper divisors (1).

20397792479 is an equidigital number, since it uses as much as digits as its factorization.

20397792479 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12002256, while the sum is 59.

The spelling of 20397792479 in words is "twenty billion, three hundred ninety-seven million, seven hundred ninety-two thousand, four hundred seventy-nine".