9923820 has 24 divisors (see below), whose sum is σ = 27786864. Its totient is φ = 2646336.

The previous prime is 9923819. The next prime is 9923821. The reversal of 9923820 is 283299.

It is an interprime number because it is at equal distance from previous prime (9923819) and next prime (9923821).

It is not an unprimeable number, because it can be changed into a prime (9923821) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 82639 + ... + 82758.

It is an arithmetic number, because the mean of its divisors is an integer number (1157786).

Almost surely, 2^9923820 is an apocalyptic number.

It is an amenable number.

9923820 is an abundant number, since it is smaller than the sum of its proper divisors (17863044).

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

9923820 is a wasteful number, since it uses less digits than its factorization.

9923820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 165409 (or 165407 counting only the distinct ones).

The product of its (nonzero) digits is 7776, while the sum is 33.

The square root of 9923820 is about 3150.2095168417. The cubic root of 9923820 is about 214.8949910858.

The spelling of 9923820 in words is "nine million, nine hundred twenty-three thousand, eight hundred twenty".