8720136020 has 12 divisors (see below), whose sum is σ = 18312285684. Its totient is φ = 3488054400.

The previous prime is 8720136011. The next prime is 8720136037. The reversal of 8720136020 is 206310278.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 6244476484 + 2475659536 = 79022^2 + 49756^2 .

It is a congruent 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, 218003381 + ... + 218003420.

It is an arithmetic number, because the mean of its divisors is an integer number (1526023807).

Almost surely, 2^8720136020 is an apocalyptic number.

It is an amenable number.

8720136020 is an abundant number, since it is smaller than the sum of its proper divisors (9592149664).

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

8720136020 is a wasteful number, since it uses less digits than its factorization.

8720136020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 436006810 (or 436006808 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 29.

The square root of 8720136020 is about 93381.6685436708. The cubic root of 8720136020 is about 2058.2956352249.

Adding to 8720136020 its reverse (206310278), we get a palindrome (8926446298).

The spelling of 8720136020 in words is "eight billion, seven hundred twenty million, one hundred thirty-six thousand, twenty".