20011321020 has 24 divisors (see below), whose sum is σ = 56031699024. Its totient is φ = 5336352256.

The previous prime is 20011321003. The next prime is 20011321049. The reversal of 20011321020 is 2012311002.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a junction number, because it is equal to n+sod(n) for n = 20011320987 and 20011321005.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 166760949 + ... + 166761068.

It is an arithmetic number, because the mean of its divisors is an integer number (2334654126).

Almost surely, 2^20011321020 is an apocalyptic number.

20011321020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20011321020 is an abundant number, since it is smaller than the sum of its proper divisors (36020378004).

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

20011321020 is a wasteful number, since it uses less digits than its factorization.

20011321020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 333522029 (or 333522027 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 12.

Adding to 20011321020 its reverse (2012311002), we get a palindrome (22023632022).

The spelling of 20011321020 in words is "twenty billion, eleven million, three hundred twenty-one thousand, twenty".