22540322420 has 144 divisors (see below), whose sum is σ = 60893477568. Its totient is φ = 6929072640.

The previous prime is 22540322407. The next prime is 22540322429. The reversal of 22540322420 is 2422304522.

It is a happy number.

It is a super-2 number, since 2×22540322420² (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 22540322420.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22540322429) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 772619 + ... + 801261.

It is an arithmetic number, because the mean of its divisors is an integer number (422871372).

Almost surely, 2^22540322420 is an apocalyptic number.

22540322420 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 22540322420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30446738784).

22540322420 is an abundant number, since it is smaller than the sum of its proper divisors (38353155148).

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

22540322420 is a wasteful number, since it uses less digits than its factorization.

22540322420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28750 (or 28741 counting only the distinct ones).

The product of its (nonzero) digits is 7680, while the sum is 26.

Adding to 22540322420 its reverse (2422304522), we get a palindrome (24962626942).

The spelling of 22540322420 in words is "twenty-two billion, five hundred forty million, three hundred twenty-two thousand, four hundred twenty".