20425280 has 112 divisors (see below), whose sum is σ = 52669440. Its totient is φ = 7526400.

The previous prime is 20425277. The next prime is 20425289. The reversal of 20425280 is 8252402.

It is not an unprimeable number, because it can be changed into a prime (20425289) 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 15 ways as a sum of consecutive naturals, for example, 287645 + ... + 287715.

Almost surely, 2^20425280 is an apocalyptic number.

20425280 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 20425280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26334720).

20425280 is an abundant number, since it is smaller than the sum of its proper divisors (32244160).

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

20425280 is a wasteful number, since it uses less digits than its factorization.

20425280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 148 (or 138 counting only the distinct ones).

The product of its (nonzero) digits is 1280, while the sum is 23.

The square root of 20425280 is about 4519.4335928300. The cubic root of 20425280 is about 273.3522625532.

Adding to 20425280 its reverse (8252402), we get a palindrome (28677682).

The spelling of 20425280 in words is "twenty million, four hundred twenty-five thousand, two hundred eighty".