20001021320 has 64 divisors (see below), whose sum is σ = 51728613120. Its totient is φ = 6817837824.

The previous prime is 20001021241. The next prime is 20001021323. The reversal of 20001021320 is 2312010002.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (20001021323) 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, 158012 + ... + 254891.

It is an arithmetic number, because the mean of its divisors is an integer number (808259580).

Almost surely, 2^20001021320 is an apocalyptic number.

20001021320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20001021320 is an abundant number, since it is smaller than the sum of its proper divisors (31727591800).

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

20001021320 is a wasteful number, since it uses less digits than its factorization.

20001021320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 413094 (or 413090 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 11.

Adding to 20001021320 its reverse (2312010002), we get a palindrome (22313031322).

The spelling of 20001021320 in words is "twenty billion, one million, twenty-one thousand, three hundred twenty".