25533220 has 48 divisors (see below), whose sum is σ = 57189888. Its totient is φ = 9553280.

The previous prime is 25533163. The next prime is 25533239. The reversal of 25533220 is 2233552.

It is a junction number, because it is equal to n+sod(n) for n = 25533191 and 25533200.

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 15 ways as a sum of consecutive naturals, for example, 21030 + ... + 22210.

It is an arithmetic number, because the mean of its divisors is an integer number (1191456).

Almost surely, 2^25533220 is an apocalyptic number.

25533220 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 25533220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28594944).

25533220 is an abundant number, since it is smaller than the sum of its proper divisors (31656668).

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

25533220 is a wasteful number, since it uses less digits than its factorization.

25533220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1260 (or 1258 counting only the distinct ones).

The product of its (nonzero) digits is 1800, while the sum is 22.

The square root of 25533220 is about 5053.0406687459. The cubic root of 25533220 is about 294.4660262915.

Adding to 25533220 its reverse (2233552), we get a palindrome (27766772).

The spelling of 25533220 in words is "twenty-five million, five hundred thirty-three thousand, two hundred twenty".