25143820 has 72 divisors (see below), whose sum is σ = 58844016. Its totient is φ = 9015552.

The previous prime is 25143817. The next prime is 25143829. The reversal of 25143820 is 2834152.

It is not an unprimeable number, because it can be changed into a prime (25143829) 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, 145254 + ... + 145426.

It is an arithmetic number, because the mean of its divisors is an integer number (817278).

Almost surely, 2^25143820 is an apocalyptic number.

25143820 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 25143820, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29422008).

25143820 is an abundant number, since it is smaller than the sum of its proper divisors (33700196).

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

25143820 is a wasteful number, since it uses less digits than its factorization.

25143820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 251 (or 236 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 25.

The square root of 25143820 is about 5014.3613750906. The cubic root of 25143820 is about 292.9614116692.

Adding to 25143820 its reverse (2834152), we get a palindrome (27977972).

The spelling of 25143820 in words is "twenty-five million, one hundred forty-three thousand, eight hundred twenty".