9720000020 has 24 divisors (see below), whose sum is σ = 20420260224. Its totient is φ = 3886426656.

The previous prime is 9720000013. The next prime is 9720000041. The reversal of 9720000020 is 200000279.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 9719999947 and 9720000001.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 47024 + ... + 147143.

It is an arithmetic number, because the mean of its divisors is an integer number (850844176).

Almost surely, 2^9720000020 is an apocalyptic number.

It is an amenable number.

9720000020 is an abundant number, since it is smaller than the sum of its proper divisors (10700260204).

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

9720000020 is a wasteful number, since it uses less digits than its factorization.

9720000020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 196679 (or 196677 counting only the distinct ones).

The product of its (nonzero) digits is 252, while the sum is 20.

The square root of 9720000020 is about 98590.0604523600. The cubic root of 9720000020 is about 2134.1359841578.

Adding to 9720000020 its reverse (200000279), we get a palindrome (9920000299).

The spelling of 9720000020 in words is "nine billion, seven hundred twenty million, twenty", and thus it is an aban number.