20009328 has 40 divisors (see below), whose sum is σ = 52080000. Its totient is φ = 6619584.

The previous prime is 20009293. The next prime is 20009329. The reversal of 20009328 is 82390002.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a junction number, because it is equal to n+sod(n) for n = 20009298 and 20009307.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20009329) 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, 5173 + ... + 8171.

It is an arithmetic number, because the mean of its divisors is an integer number (1302000).

Almost surely, 2^20009328 is an apocalyptic number.

It is an amenable number.

20009328 is an abundant number, since it is smaller than the sum of its proper divisors (32070672).

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

20009328 is a wasteful number, since it uses less digits than its factorization.

20009328 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3149 (or 3143 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 24.

The square root of 20009328 is about 4473.1787355302. The cubic root of 20009328 is about 271.4839552464.

The spelling of 20009328 in words is "twenty million, nine thousand, three hundred twenty-eight".