22001262640 has 240 divisors, whose sum is σ = 64714777632. Its totient is φ = 6906912768.

The previous prime is 22001262593. The next prime is 22001262643. The reversal of 22001262640 is 4626210022.

It is not an unprimeable number, because it can be changed into a prime (22001262643) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2461219 + ... + 2470141.

Almost surely, 2^22001262640 is an apocalyptic number.

22001262640 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 22001262640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32357388816).

22001262640 is an abundant number, since it is smaller than the sum of its proper divisors (42713514992).

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

22001262640 is a wasteful number, since it uses less digits than its factorization.

22001262640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9004 (or 8991 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 25.

Adding to 22001262640 its reverse (4626210022), we get a palindrome (26627472662).

The spelling of 22001262640 in words is "twenty-two billion, one million, two hundred sixty-two thousand, six hundred forty".