9720920 has 32 divisors (see below), whose sum is σ = 23861520. Its totient is φ = 3534720.

The previous prime is 9720917. The next prime is 9720937. The reversal of 9720920 is 290279.

9720920 = T₇₅₁ + T₇₅₂ + ... + T₇₈₃.

It is a happy number.

It is a Smith number, since the sum of its digits (29) coincides with the sum of the digits of its prime factors.

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, 10607 + ... + 11486.

Almost surely, 2^9720920 is an apocalyptic number.

It is an amenable number.

9720920 is an abundant number, since it is smaller than the sum of its proper divisors (14140600).

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

9720920 is a wasteful number, since it uses less digits than its factorization.

9720920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22115 (or 22111 counting only the distinct ones).

The product of its (nonzero) digits is 2268, while the sum is 29.

The square root of 9720920 is about 3117.8389952016. The cubic root of 9720920 is about 213.4203312706.

The spelling of 9720920 in words is "nine million, seven hundred twenty thousand, nine hundred twenty".