25401220 has 48 divisors (see below), whose sum is σ = 57915648. Its totient is φ = 9302400.

The previous prime is 25401217. The next prime is 25401221. The reversal of 25401220 is 2210452.

It is a junction number, because it is equal to n+sod(n) for n = 25401194 and 25401203.

It is not an unprimeable number, because it can be changed into a prime (25401221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 38937 + ... + 39583.

It is an arithmetic number, because the mean of its divisors is an integer number (1206576).

Almost surely, 2^25401220 is an apocalyptic number.

25401220 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 25401220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28957824).

25401220 is an abundant number, since it is smaller than the sum of its proper divisors (32514428).

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

25401220 is a wasteful number, since it uses less digits than its factorization.

25401220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 820 (or 818 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 16.

The square root of 25401220 is about 5039.9623014463. The cubic root of 25401220 is about 293.9577121525.

Adding to 25401220 its reverse (2210452), we get a palindrome (27611672).

The spelling of 25401220 in words is "twenty-five million, four hundred one thousand, two hundred twenty".