9997020 has 216 divisors, whose sum is σ = 36599472. Its totient is φ = 2280960.

The previous prime is 9997007. The next prime is 9997033. The reversal of 9997020 is 207999.

9997020 = T₂₂₉ + T₂₃₀ + ... + T₄₁₅.

It is an interprime number because it is at equal distance from previous prime (9997007) and next prime (9997033).

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 588052 + ... + 588068.

It is an arithmetic number, because the mean of its divisors is an integer number (169442).

Almost surely, 2^9997020 is an apocalyptic number.

9997020 is a gapful number since it is divisible by the number (90) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 9997020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (18299736).

9997020 is an abundant number, since it is smaller than the sum of its proper divisors (26602452).

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

9997020 is a wasteful number, since it uses less digits than its factorization.

9997020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63 (or 38 counting only the distinct ones).

The product of its (nonzero) digits is 10206, while the sum is 36.

The square root of 9997020 is about 3161.8064456889. The cubic root of 9997020 is about 215.4220661591.

The spelling of 9997020 in words is "nine million, nine hundred ninety-seven thousand, twenty".