9920500 has 24 divisors (see below), whose sum is σ = 21667464. Its totient is φ = 3968000.

The previous prime is 9920479. The next prime is 9920501. The reversal of 9920500 is 50299.

It can be written as a sum of positive squares in 4 ways, for example, as 2802276 + 7118224 = 1674^2 + 2668^2 .

It is a Harshad number since it is a multiple of its sum of digits (25).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9920501) 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, 9421 + ... + 10420.

It is an arithmetic number, because the mean of its divisors is an integer number (902811).

Almost surely, 2^9920500 is an apocalyptic number.

It is an amenable number.

9920500 is an abundant number, since it is smaller than the sum of its proper divisors (11746964).

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

9920500 is a wasteful number, since it uses less digits than its factorization.

9920500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19860 (or 19848 counting only the distinct ones).

The product of its (nonzero) digits is 810, while the sum is 25.

The square root of 9920500 is about 3149.6825236839. The cubic root of 9920500 is about 214.8710241407.

Adding to 9920500 its reverse (50299), we get a palindrome (9970799).

The spelling of 9920500 in words is "nine million, nine hundred twenty thousand, five hundred".