25550320 has 40 divisors (see below), whose sum is σ = 62902224. Its totient is φ = 9618432.

The previous prime is 25550311. The next prime is 25550323. The reversal of 25550320 is 2305552.

It is a tau number, because it is divible by the number of its divisors (40).

It is a junction number, because it is equal to n+sod(n) for n = 25550291 and 25550300.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25550323) 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, 8034 + ... + 10753.

Almost surely, 2^25550320 is an apocalyptic number.

25550320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25550320 is an abundant number, since it is smaller than the sum of its proper divisors (37351904).

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

25550320 is a wasteful number, since it uses less digits than its factorization.

25550320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18817 (or 18811 counting only the distinct ones).

The product of its (nonzero) digits is 1500, while the sum is 22.

The square root of 25550320 is about 5054.7324360445. The cubic root of 25550320 is about 294.5317478022.

Adding to 25550320 its reverse (2305552), we get a palindrome (27855872).

The spelling of 25550320 in words is "twenty-five million, five hundred fifty thousand, three hundred twenty".