20640044695 has 8 divisors (see below), whose sum is σ = 24770430720. Its totient is φ = 16510451040.

The previous prime is 20640044693. The next prime is 20640044701. The reversal of 20640044695 is 59644004602.

It is a happy number.

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

It is not a de Polignac number, because 20640044695 - 2¹ = 20640044693 is a prime.

It is a super-2 number, since 2×20640044695² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20640044693) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 139191 + ... + 246280.

It is an arithmetic number, because the mean of its divisors is an integer number (3096303840).

Almost surely, 2^20640044695 is an apocalyptic number.

20640044695 is a deficient number, since it is larger than the sum of its proper divisors (4130386025).

20640044695 is a wasteful number, since it uses less digits than its factorization.

20640044695 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 396185.

The product of its (nonzero) digits is 207360, while the sum is 40.

The spelling of 20640044695 in words is "twenty billion, six hundred forty million, forty-four thousand, six hundred ninety-five".