20323121020 has 48 divisors (see below), whose sum is σ = 43185770208. Its totient is φ = 8032953600.

The previous prime is 20323121009. The next prime is 20323121029. The reversal of 20323121020 is 2012132302.

It is a junction number, because it is equal to n+sod(n) for n = 20323120985 and 20323121003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20323121029) 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, 1046842 + ... + 1066078.

It is an arithmetic number, because the mean of its divisors is an integer number (899703546).

Almost surely, 2^20323121020 is an apocalyptic number.

20323121020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20323121020 is an abundant number, since it is smaller than the sum of its proper divisors (22862649188).

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

20323121020 is a wasteful number, since it uses less digits than its factorization.

20323121020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19870 (or 19868 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 16.

Adding to 20323121020 its reverse (2012132302), we get a palindrome (22335253322).

The spelling of 20323121020 in words is "twenty billion, three hundred twenty-three million, one hundred twenty-one thousand, twenty".