25806226420 has 48 divisors (see below), whose sum is σ = 58549615488. Its totient is φ = 9497784960.

The previous prime is 25806226373. The next prime is 25806226421. The reversal of 25806226420 is 2462260852.

It is a happy number.

It is a super-2 number, since 2×25806226420² (a number of 22 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 25806226420.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25806226421) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 78714 + ... + 240433.

It is an arithmetic number, because the mean of its divisors is an integer number (1219783656).

Almost surely, 2^25806226420 is an apocalyptic number.

25806226420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25806226420 is an abundant number, since it is smaller than the sum of its proper divisors (32743389068).

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

25806226420 is a wasteful number, since it uses less digits than its factorization.

25806226420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 319480 (or 319478 counting only the distinct ones).

The product of its (nonzero) digits is 92160, while the sum is 37.

It can be divided in two parts, 258062 and 26420, that added together give a palindrome (284482).

The spelling of 25806226420 in words is "twenty-five billion, eight hundred six million, two hundred twenty-six thousand, four hundred twenty".