25543220 has 24 divisors (see below), whose sum is σ = 56464800. Its totient is φ = 9679392.

The previous prime is 25543187. The next prime is 25543223. The reversal of 25543220 is 2234552.

It is a plaindrome in base 11.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25543223) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 33230 + ... + 33989.

It is an arithmetic number, because the mean of its divisors is an integer number (2352700).

Almost surely, 2^25543220 is an apocalyptic number.

25543220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25543220 is an abundant number, since it is smaller than the sum of its proper divisors (30921580).

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

25543220 is a wasteful number, since it uses less digits than its factorization.

25543220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67247 (or 67245 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 23.

The square root of 25543220 is about 5054.0300750985. The cubic root of 25543220 is about 294.5044634846.

Adding to 25543220 its reverse (2234552), we get a palindrome (27777772).

The spelling of 25543220 in words is "twenty-five million, five hundred forty-three thousand, two hundred twenty".