25630220 has 144 divisors (see below), whose sum is σ = 72394560. Its totient is φ = 7434240.

The previous prime is 25630201. The next prime is 25630243. The reversal of 25630220 is 2203652.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 25630192 and 25630201.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 287936 + ... + 288024.

It is an arithmetic number, because the mean of its divisors is an integer number (502740).

Almost surely, 2^25630220 is an apocalyptic number.

25630220 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 25630220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36197280).

25630220 is an abundant number, since it is smaller than the sum of its proper divisors (46764340).

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

25630220 is a wasteful number, since it uses less digits than its factorization.

25630220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 144 (or 131 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 20.

The square root of 25630220 is about 5062.6297514237. The cubic root of 25630220 is about 294.8384445296.

Adding to 25630220 its reverse (2203652), we get a palindrome (27833872).

The spelling of 25630220 in words is "twenty-five million, six hundred thirty thousand, two hundred twenty".