20427085439 has 4 divisors (see below), whose sum is σ = 20430458424. Its totient is φ = 20423712456.

The previous prime is 20427085423. The next prime is 20427085463. The reversal of 20427085439 is 93458072402.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 93458072402 = 2 ⋅46729036201.

It is a cyclic number.

It is not a de Polignac number, because 20427085439 - 2⁴ = 20427085423 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20427085439.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20427085499) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1677392 + ... + 1689525.

It is an arithmetic number, because the mean of its divisors is an integer number (5107614606).

Almost surely, 2^20427085439 is an apocalyptic number.

20427085439 is a deficient number, since it is larger than the sum of its proper divisors (3372985).

20427085439 is an equidigital number, since it uses as much as digits as its factorization.

20427085439 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3372984.

The product of its (nonzero) digits is 483840, while the sum is 44.

The spelling of 20427085439 in words is "twenty billion, four hundred twenty-seven million, eighty-five thousand, four hundred thirty-nine".