25400220 has 48 divisors (see below), whose sum is σ = 71383200. Its totient is φ = 6748416.

The previous prime is 25400171. The next prime is 25400233. The reversal of 25400220 is 2200452.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 25400220.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20334 + ... + 21546.

It is an arithmetic number, because the mean of its divisors is an integer number (1487150).

Almost surely, 2^25400220 is an apocalyptic number.

25400220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25400220 is an abundant number, since it is smaller than the sum of its proper divisors (45982980).

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

25400220 is a wasteful number, since it uses less digits than its factorization.

25400220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1574 (or 1572 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 15.

The square root of 25400220 is about 5039.8630933786. The cubic root of 25400220 is about 293.9538545744.

Adding to 25400220 its reverse (2200452), we get a palindrome (27600672).

The spelling of 25400220 in words is "twenty-five million, four hundred thousand, two hundred twenty".