25223220 has 72 divisors (see below), whose sum is σ = 83472480. Its totient is φ = 6114240.

The previous prime is 25223213. The next prime is 25223221. The reversal of 25223220 is 2232252.

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 = 25223193 and 25223202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25223221) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4390 + ... + 8349.

It is an arithmetic number, because the mean of its divisors is an integer number (1159340).

Almost surely, 2^25223220 is an apocalyptic number.

25223220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25223220 is an abundant number, since it is smaller than the sum of its proper divisors (58249260).

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

25223220 is a wasteful number, since it uses less digits than its factorization.

25223220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12765 (or 12760 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 18.

The square root of 25223220 is about 5022.2723940463. The cubic root of 25223220 is about 293.2694621036.

Adding to 25223220 its reverse (2232252), we get a palindrome (27455472).

It can be divided in two parts, 252232 and 20, that added together give a palindrome (252252).

The spelling of 25223220 in words is "twenty-five million, two hundred twenty-three thousand, two hundred twenty".