20023345646720 has 128 divisors (see below), whose sum is σ = 51685093232640. Its totient is φ = 7373930655744.

The previous prime is 20023345646701. The next prime is 20023345646749. The reversal of 20023345646720 is 2764654332002.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (128).

It is an unprimeable number.

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, 44717 + ... + 6328403.

It is an arithmetic number, because the mean of its divisors is an integer number (403789790880).

Almost surely, 2^{20023345646720} is an apocalyptic number.

20023345646720 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 20023345646720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25842546616320).

20023345646720 is an abundant number, since it is smaller than the sum of its proper divisors (31661747585920).

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

20023345646720 is a wasteful number, since it uses less digits than its factorization.

20023345646720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6284102 (or 6284090 counting only the distinct ones).

The product of its (nonzero) digits is 1451520, while the sum is 44.

Adding to 20023345646720 its reverse (2764654332002), we get a palindrome (22787999978722).

The spelling of 20023345646720 in words is "twenty trillion, twenty-three billion, three hundred forty-five million, six hundred forty-six thousand, seven hundred twenty".