20934422865 has 20 divisors (see below), whose sum is σ = 37526892084. Its totient is φ = 11165025312.

The previous prime is 20934422843. The next prime is 20934422867. The reversal of 20934422865 is 56822443902.

20934422865 is a `hidden beast` number, since 20 + 9 + 344 + 2 + 286 + 5 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 3309470784 + 17624952081 = 57528^2 + 132759^2 .

It is not a de Polignac number, because 20934422865 - 2⁶ = 20934422801 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 20934422865.

It is not an unprimeable number, because it can be changed into a prime (20934422867) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 25844562 + ... + 25845371.

Almost surely, 2^20934422865 is an apocalyptic number.

It is an amenable number.

20934422865 is a deficient number, since it is larger than the sum of its proper divisors (16592469219).

20934422865 is an equidigital number, since it uses as much as digits as its factorization.

20934422865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51689950 (or 51689941 counting only the distinct ones).

The product of its (nonzero) digits is 829440, while the sum is 45.

The spelling of 20934422865 in words is "twenty billion, nine hundred thirty-four million, four hundred twenty-two thousand, eight hundred sixty-five".