20340221264 has 80 divisors (see below), whose sum is σ = 44233091520. Its totient is φ = 8982420480.

The previous prime is 20340221263. The next prime is 20340221299. The reversal of 20340221264 is 46212204302.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20340221263) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 849002 + ... + 872630.

It is an arithmetic number, because the mean of its divisors is an integer number (552913644).

Almost surely, 2^20340221264 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20340221264, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22116545760).

20340221264 is an abundant number, since it is smaller than the sum of its proper divisors (23892870256).

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

20340221264 is a wasteful number, since it uses less digits than its factorization.

20340221264 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23788 (or 23782 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 26.

Adding to 20340221264 its reverse (46212204302), we get a palindrome (66552425566).

The spelling of 20340221264 in words is "twenty billion, three hundred forty million, two hundred twenty-one thousand, two hundred sixty-four".