8020207640 has 128 divisors (see below), whose sum is σ = 20048549760. Its totient is φ = 2872049664.

The previous prime is 8020207631. The next prime is 8020207673. The reversal of 8020207640 is 467020208.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3017192 + ... + 3019848.

It is an arithmetic number, because the mean of its divisors is an integer number (156629295).

Almost surely, 2^8020207640 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 8020207640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (10024274880).

8020207640 is an abundant number, since it is smaller than the sum of its proper divisors (12028342120).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

8020207640 is a wasteful number, since it uses less digits than its factorization.

8020207640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2901 (or 2897 counting only the distinct ones).

The product of its (nonzero) digits is 5376, while the sum is 29.

The square root of 8020207640 is about 89555.6119961223. The cubic root of 8020207640 is about 2001.6825541089.

Adding to 8020207640 its reverse (467020208), we get a palindrome (8487227848).

The spelling of 8020207640 in words is "eight billion, twenty million, two hundred seven thousand, six hundred forty".