20440020321 has 72 divisors (see below), whose sum is σ = 34766115072. Its totient is φ = 11335680000.

The previous prime is 20440020301. The next prime is 20440020347. The reversal of 20440020321 is 12302004402.

20440020321 is a `hidden beast` number, since 2 + 0 + 440 + 0 + 203 + 21 = 666.

It is not a de Polignac number, because 20440020321 - 2¹⁰ = 20440019297 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20440020294 and 20440020303.

It is not an unprimeable number, because it can be changed into a prime (20440020301) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 27216696 + ... + 27217446.

Almost surely, 2^20440020321 is an apocalyptic number.

20440020321 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

20440020321 is a deficient number, since it is larger than the sum of its proper divisors (14326094751).

20440020321 is a wasteful number, since it uses less digits than its factorization.

20440020321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1103 (or 1059 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 18.

Adding to 20440020321 its reverse (12302004402), we get a palindrome (32742024723).

The spelling of 20440020321 in words is "twenty billion, four hundred forty million, twenty thousand, three hundred twenty-one".