25220424 has 16 divisors (see below), whose sum is σ = 63051120. Its totient is φ = 8406800.

The previous prime is 25220423. The next prime is 25220431. The reversal of 25220424 is 42402252.

It is a self number, because there is not a number n which added to its sum of digits gives 25220424.

It is not an unprimeable number, because it can be changed into a prime (25220423) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 525402 + ... + 525449.

It is an arithmetic number, because the mean of its divisors is an integer number (3940695).

Almost surely, 2^25220424 is an apocalyptic number.

25220424 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

25220424 is an abundant number, since it is smaller than the sum of its proper divisors (37830696).

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

25220424 is a wasteful number, since it uses less digits than its factorization.

25220424 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1050860 (or 1050856 counting only the distinct ones).

The product of its (nonzero) digits is 1280, while the sum is 21.

The square root of 25220424 is about 5021.9940262808. The cubic root of 25220424 is about 293.2586253731.

Adding to 25220424 its reverse (42402252), we get a palindrome (67622676).

The spelling of 25220424 in words is "twenty-five million, two hundred twenty thousand, four hundred twenty-four".