20863265775 has 24 divisors (see below), whose sum is σ = 37629746304. Its totient is φ = 10115522400.

The previous prime is 20863265693. The next prime is 20863265791. The reversal of 20863265775 is 57756236802.

It is a happy number.

It is not a de Polignac number, because 20863265775 - 2⁸ = 20863265519 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 12643579 + ... + 12645228.

It is an arithmetic number, because the mean of its divisors is an integer number (1567906096).

Almost surely, 2^20863265775 is an apocalyptic number.

20863265775 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

20863265775 is a deficient number, since it is larger than the sum of its proper divisors (16766480529).

20863265775 is a wasteful number, since it uses less digits than its factorization.

20863265775 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25288831 (or 25288826 counting only the distinct ones).

The product of its (nonzero) digits is 4233600, while the sum is 51.

The spelling of 20863265775 in words is "twenty billion, eight hundred sixty-three million, two hundred sixty-five thousand, seven hundred seventy-five".