20495567 has 2 divisors, whose sum is σ = 20495568. Its totient is φ = 20495566.

The previous prime is 20495539. The next prime is 20495569. The reversal of 20495567 is 76559402.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20495567 - 2¹⁰ = 20494543 is a prime.

Together with 20495569, it forms a pair of twin primes.

It is a Chen prime.

It is a plaindrome in base 16.

It is a self number, because there is not a number n which added to its sum of digits gives 20495567.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20495569) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10247783 + 10247784.

It is an arithmetic number, because the mean of its divisors is an integer number (10247784).

Almost surely, 2^20495567 is an apocalyptic number.

20495567 is a deficient number, since it is larger than the sum of its proper divisors (1).

20495567 is an equidigital number, since it uses as much as digits as its factorization.

20495567 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 75600, while the sum is 38.

The square root of 20495567 is about 4527.2029996456. The cubic root of 20495567 is about 273.6654547337.

The spelling of 20495567 in words is "twenty million, four hundred ninety-five thousand, five hundred sixty-seven".