20265205705 has 8 divisors (see below), whose sum is σ = 24355040904. Its totient is φ = 16187635200.

The previous prime is 20265205699. The next prime is 20265205711. The reversal of 20265205705 is 50750256202.

It is an interprime number because it is at equal distance from previous prime (20265205699) and next prime (20265205711).

It can be written as a sum of positive squares in 4 ways, for example, as 3205711161 + 17059494544 = 56619^2 + 130612^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20265205705 - 2⁷ = 20265205577 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3062536 + ... + 3069145.

It is an arithmetic number, because the mean of its divisors is an integer number (3044380113).

Almost surely, 2^20265205705 is an apocalyptic number.

It is an amenable number.

20265205705 is a deficient number, since it is larger than the sum of its proper divisors (4089835199).

20265205705 is an equidigital number, since it uses as much as digits as its factorization.

20265205705 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6132347.

The product of its (nonzero) digits is 42000, while the sum is 34.

The spelling of 20265205705 in words is "twenty billion, two hundred sixty-five million, two hundred five thousand, seven hundred five".