20001223211020 has 24 divisors (see below), whose sum is σ = 42896240420544. Its totient is φ = 7830266107776.

The previous prime is 20001223210981. The next prime is 20001223211029. The reversal of 20001223211020 is 2011232210002.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 20001223210985 and 20001223211003.

It is not an unprimeable number, because it can be changed into a prime (20001223211029) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10638947577 + ... + 10638949456.

It is an arithmetic number, because the mean of its divisors is an integer number (1787343350856).

Almost surely, 2^{20001223211020} is an apocalyptic number.

20001223211020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20001223211020 is an abundant number, since it is smaller than the sum of its proper divisors (22895017209524).

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

20001223211020 is a wasteful number, since it uses less digits than its factorization.

20001223211020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21277897089 (or 21277897087 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 16.

Adding to 20001223211020 its reverse (2011232210002), we get a palindrome (22012455421022).

The spelling of 20001223211020 in words is "twenty trillion, one billion, two hundred twenty-three million, two hundred eleven thousand, twenty".