20090320 has 40 divisors (see below), whose sum is σ = 47166624. Its totient is φ = 7957632.

The previous prime is 20090309. The next prime is 20090327. The reversal of 20090320 is 2309002.

It is a tau number, because it is divible by the number of its divisors (40).

It is a Harshad number since it is a multiple of its sum of digits (16).

It is a junction number, because it is equal to n+sod(n) for n = 20090294 and 20090303.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20090327) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 7387 + ... + 9733.

Almost surely, 2^20090320 is an apocalyptic number.

20090320 is a gapful number since it is divisible by the number (20) 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 20090320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23583312).

20090320 is an abundant number, since it is smaller than the sum of its proper divisors (27076304).

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

20090320 is a wasteful number, since it uses less digits than its factorization.

20090320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2467 (or 2461 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 16.

The square root of 20090320 is about 4482.2226629207. Note that the first 3 decimals coincide. The cubic root of 20090320 is about 271.8497584352.

Adding to 20090320 its reverse (2309002), we get a palindrome (22399322).

The spelling of 20090320 in words is "twenty million, ninety thousand, three hundred twenty".