25124420 has 24 divisors (see below), whose sum is σ = 53232984. Its totient is φ = 9959936.

The previous prime is 25124413. The next prime is 25124423. The reversal of 25124420 is 2442152.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 1290496 + 23833924 = 1136^2 + 4882^2 .

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 25124392 and 25124401.

It is not an unprimeable number, because it can be changed into a prime (25124423) 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, 3299 + ... + 7818.

It is an arithmetic number, because the mean of its divisors is an integer number (2218041).

Almost surely, 2^25124420 is an apocalyptic number.

25124420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25124420 is an abundant number, since it is smaller than the sum of its proper divisors (28108564).

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

25124420 is a wasteful number, since it uses less digits than its factorization.

25124420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11239 (or 11237 counting only the distinct ones).

The product of its (nonzero) digits is 640, while the sum is 20.

The square root of 25124420 is about 5012.4265580655. The cubic root of 25124420 is about 292.8860463810.

Adding to 25124420 its reverse (2442152), we get a palindrome (27566572).

The spelling of 25124420 in words is "twenty-five million, one hundred twenty-four thousand, four hundred twenty".