25245220 has 144 divisors (see below), whose sum is σ = 72309888. Its totient is φ = 7188480.

The previous prime is 25245139. The next prime is 25245229. The reversal of 25245220 is 2254252.

25245220 = T₂₄₁ + T₂₄₂ + ... + T₅₄₈.

It is a happy number.

It is a super-2 number, since 2×25245220² = 1274642265696800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is a junction number, because it is equal to n+sod(n) for n = 25245191 and 25245200.

It is not an unprimeable number, because it can be changed into a prime (25245229) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 260212 + ... + 260308.

It is an arithmetic number, because the mean of its divisors is an integer number (502152).

Almost surely, 2^25245220 is an apocalyptic number.

25245220 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 25245220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36154944).

25245220 is an abundant number, since it is smaller than the sum of its proper divisors (47064668).

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

25245220 is a wasteful number, since it uses less digits than its factorization.

25245220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 150 (or 135 counting only the distinct ones).

The product of its (nonzero) digits is 1600, while the sum is 22.

The square root of 25245220 is about 5024.4621602715. The cubic root of 25245220 is about 293.3547017262.

Adding to 25245220 its reverse (2254252), we get a palindrome (27499472).

It can be divided in two parts, 2524 and 5220, that added together give a square (7744 = 88²).

The spelling of 25245220 in words is "twenty-five million, two hundred forty-five thousand, two hundred twenty".