20320641007 has 4 divisors (see below), whose sum is σ = 20475760536. Its totient is φ = 20165521480.

The previous prime is 20320640971. The next prime is 20320641017. The reversal of 20320641007 is 70014602302.

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

It is a cyclic number.

It is not a de Polignac number, because 20320641007 - 2¹⁵ = 20320608239 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20320641017) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 77559568 + ... + 77559829.

It is an arithmetic number, because the mean of its divisors is an integer number (5118940134).

Almost surely, 2^20320641007 is an apocalyptic number.

20320641007 is a deficient number, since it is larger than the sum of its proper divisors (155119529).

20320641007 is a wasteful number, since it uses less digits than its factorization.

20320641007 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 155119528.

The product of its (nonzero) digits is 2016, while the sum is 25.

The spelling of 20320641007 in words is "twenty billion, three hundred twenty million, six hundred forty-one thousand, seven".