20507423479 has 2 divisors, whose sum is σ = 20507423480. Its totient is φ = 20507423478.

The previous prime is 20507423477. The next prime is 20507423513. The reversal of 20507423479 is 97432470502.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20507423479 - 2¹ = 20507423477 is a prime.

Together with 20507423477, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20507423477) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10253711739 + 10253711740.

It is an arithmetic number, because the mean of its divisors is an integer number (10253711740).

Almost surely, 2^20507423479 is an apocalyptic number.

20507423479 is a deficient number, since it is larger than the sum of its proper divisors (1).

20507423479 is an equidigital number, since it uses as much as digits as its factorization.

20507423479 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 423360, while the sum is 43.

The spelling of 20507423479 in words is "twenty billion, five hundred seven million, four hundred twenty-three thousand, four hundred seventy-nine".