25535220 has 48 divisors (see below), whose sum is σ = 71873088. Its totient is φ = 6773760.

The previous prime is 25535219. The next prime is 25535233. The reversal of 25535220 is 2253552.

It is a hoax number, since the sum of its digits (24) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11652 + ... + 13668.

It is an arithmetic number, because the mean of its divisors is an integer number (1497356).

Almost surely, 2^25535220 is an apocalyptic number.

25535220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25535220 is an abundant number, since it is smaller than the sum of its proper divisors (46337868).

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

25535220 is a wasteful number, since it uses less digits than its factorization.

25535220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2240 (or 2238 counting only the distinct ones).

The product of its (nonzero) digits is 3000, while the sum is 24.

The square root of 25535220 is about 5053.2385655142. The cubic root of 25535220 is about 294.4737145328.

Adding to 25535220 its reverse (2253552), we get a palindrome (27788772).

The spelling of 25535220 in words is "twenty-five million, five hundred thirty-five thousand, two hundred twenty".