20290480 has 80 divisors (see below), whose sum is σ = 56782080. Its totient is φ = 6587136.

The previous prime is 20290471. The next prime is 20290489. The reversal of 20290480 is 8409202.

It is an interprime number because it is at equal distance from previous prime (20290471) and next prime (20290489).

It is a tau number, because it is divible by the number of its divisors (80).

It is not an unprimeable number, because it can be changed into a prime (20290489) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9687 + ... + 11593.

It is an arithmetic number, because the mean of its divisors is an integer number (709776).

Almost surely, 2^20290480 is an apocalyptic number.

20290480 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 20290480, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28391040).

20290480 is an abundant number, since it is smaller than the sum of its proper divisors (36491600).

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

20290480 is a wasteful number, since it uses less digits than its factorization.

20290480 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1946 (or 1940 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 25.

The square root of 20290480 is about 4504.4955322433. The cubic root of 20290480 is about 272.7495903622.

Adding to 20290480 its reverse (8409202), we get a palindrome (28699682).

The spelling of 20290480 in words is "twenty million, two hundred ninety thousand, four hundred eighty".