25445220 has 48 divisors (see below), whose sum is σ = 71550528. Its totient is φ = 6756480.

The previous prime is 25445219. The next prime is 25445221. The reversal of 25445220 is 2254452.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (25445219) and next prime (25445221).

It is not an unprimeable number, because it can be changed into a prime (25445221) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15855 + ... + 17385.

It is an arithmetic number, because the mean of its divisors is an integer number (1490636).

Almost surely, 2^25445220 is an apocalyptic number.

25445220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25445220 is an abundant number, since it is smaller than the sum of its proper divisors (46105308).

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

25445220 is a wasteful number, since it uses less digits than its factorization.

25445220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1820 (or 1818 counting only the distinct ones).

The product of its (nonzero) digits is 3200, while the sum is 24.

The square root of 25445220 is about 5044.3255247853. The cubic root of 25445220 is about 294.1273454527.

Adding to 25445220 its reverse (2254452), we get a palindrome (27699672).

The spelling of 25445220 in words is "twenty-five million, four hundred forty-five thousand, two hundred twenty".