25280020 has 24 divisors (see below), whose sum is σ = 56211624. Its totient is φ = 9517056.

The previous prime is 25280009. The next prime is 25280033. The reversal of 25280020 is 2008252.

It can be written as a sum of positive squares in 4 ways, for example, as 7941124 + 17338896 = 2818^2 + 4164^2 .

It is a super-2 number, since 2×25280020² = 1278158822400800, which contains 22 as substring.

It is a plaindrome in base 15.

It is a self number, because there is not a number n which added to its sum of digits gives 25280020.

It is a congruent number.

It is an unprimeable number.

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, 36837 + ... + 37516.

It is an arithmetic number, because the mean of its divisors is an integer number (2342151).

Almost surely, 2^25280020 is an apocalyptic number.

25280020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25280020 is an abundant number, since it is smaller than the sum of its proper divisors (30931604).

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

25280020 is a wasteful number, since it uses less digits than its factorization.

25280020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74379 (or 74377 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 19.

The square root of 25280020 is about 5027.9240248834. The cubic root of 25280020 is about 293.4894342467.

Adding to 25280020 its reverse (2008252), we get a palindrome (27288272).

The spelling of 25280020 in words is "twenty-five million, two hundred eighty thousand, twenty".