25017220 has 24 divisors (see below), whose sum is σ = 52920000. Its totient is φ = 9933792.

The previous prime is 25017211. The next prime is 25017221. The reversal of 25017220 is 2271052.

It is a super-2 number, since 2×25017220² = 1251722593056800, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (25017221) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1720 + ... + 7279.

It is an arithmetic number, because the mean of its divisors is an integer number (2205000).

Almost surely, 2^25017220 is an apocalyptic number.

25017220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25017220 is an abundant number, since it is smaller than the sum of its proper divisors (27902780).

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

25017220 is a wasteful number, since it uses less digits than its factorization.

25017220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9147 (or 9145 counting only the distinct ones).

The product of its (nonzero) digits is 280, while the sum is 19.

The square root of 25017220 is about 5001.7217035737. The cubic root of 25017220 is about 292.4688938602.

Subtracting from 25017220 its sum of digits (19), we obtain a triangular number (25017201 = T₇₀₇₃).

Adding to 25017220 its reverse (2271052), we get a palindrome (27288272).

The spelling of 25017220 in words is "twenty-five million, seventeen thousand, two hundred twenty".