20013574865 has 4 divisors (see below), whose sum is σ = 24016289844. Its totient is φ = 16010859888.

The previous prime is 20013574829. The next prime is 20013574871. The reversal of 20013574865 is 56847531002.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 4202021329 + 15811553536 = 64823^2 + 125744^2 .

It is a cyclic number.

It is not a de Polignac number, because 20013574865 - 2¹⁰ = 20013573841 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2001357482 + ... + 2001357491.

It is an arithmetic number, because the mean of its divisors is an integer number (6004072461).

Almost surely, 2^20013574865 is an apocalyptic number.

It is an amenable number.

20013574865 is a deficient number, since it is larger than the sum of its proper divisors (4002714979).

20013574865 is an equidigital number, since it uses as much as digits as its factorization.

20013574865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4002714978.

The product of its (nonzero) digits is 201600, while the sum is 41.

The spelling of 20013574865 in words is "twenty billion, thirteen million, five hundred seventy-four thousand, eight hundred sixty-five".