25331220 has 36 divisors (see below), whose sum is σ = 76838580. Its totient is φ = 6754944.

The previous prime is 25331213. The next prime is 25331227. The reversal of 25331220 is 2213352.

It is an interprime number because it is at equal distance from previous prime (25331213) and next prime (25331227).

It can be written as a sum of positive squares in 2 ways, for example, as 17943696 + 7387524 = 4236^2 + 2718^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 25331193 and 25331202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25331227) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 70185 + ... + 70544.

It is an arithmetic number, because the mean of its divisors is an integer number (2134405).

Almost surely, 2^25331220 is an apocalyptic number.

25331220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25331220 is an abundant number, since it is smaller than the sum of its proper divisors (51507360).

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

25331220 is a wasteful number, since it uses less digits than its factorization.

25331220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 140744 (or 140739 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 18.

The square root of 25331220 is about 5033.0130140901. The cubic root of 25331220 is about 293.6874368044.

Adding to 25331220 its reverse (2213352), we get a palindrome (27544572).

The spelling of 25331220 in words is "twenty-five million, three hundred thirty-one thousand, two hundred twenty".