25117620 has 96 divisors (see below), whose sum is σ = 80801280. Its totient is φ = 5765760.

The previous prime is 25117607. The next prime is 25117637. The reversal of 25117620 is 2671152.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 11539 + ... + 13541.

It is an arithmetic number, because the mean of its divisors is an integer number (841680).

Almost surely, 2^25117620 is an apocalyptic number.

25117620 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 25117620, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (40400640).

25117620 is an abundant number, since it is smaller than the sum of its proper divisors (55683660).

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

25117620 is a wasteful number, since it uses less digits than its factorization.

25117620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2045 (or 2043 counting only the distinct ones).

The product of its (nonzero) digits is 840, while the sum is 24.

The square root of 25117620 is about 5011.7481979844. The cubic root of 25117620 is about 292.8596204997.

Adding to 25117620 its reverse (2671152), we get a palindrome (27788772).

It can be divided in two parts, 251 and 17620, that added together give a palindrome (17871).

The spelling of 25117620 in words is "twenty-five million, one hundred seventeen thousand, six hundred twenty".