25533420 has 72 divisors (see below), whose sum is σ = 78606192. Its totient is φ = 6188160.

The previous prime is 25533419. The next prime is 25533433. The reversal of 25533420 is 2433552.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5502 + ... + 9018.

Almost surely, 2^25533420 is an apocalyptic number.

25533420 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 25533420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (39303096).

25533420 is an abundant number, since it is smaller than the sum of its proper divisors (53072772).

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

25533420 is a wasteful number, since it uses less digits than its factorization.

25533420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3551 (or 3538 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 24.

The square root of 25533420 is about 5053.0604587715. The cubic root of 25533420 is about 294.4667951337.

Adding to 25533420 its reverse (2433552), we get a palindrome (27966972).

The spelling of 25533420 in words is "twenty-five million, five hundred thirty-three thousand, four hundred twenty".