20311223320 has 16 divisors (see below), whose sum is σ = 45700252560. Its totient is φ = 8124489312.

The previous prime is 20311223311. The next prime is 20311223327. The reversal of 20311223320 is 2332211302.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20311223327) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 253890252 + ... + 253890331.

It is an arithmetic number, because the mean of its divisors is an integer number (2856265785).

Almost surely, 2^20311223320 is an apocalyptic number.

20311223320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20311223320 is an abundant number, since it is smaller than the sum of its proper divisors (25389029240).

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

20311223320 is a wasteful number, since it uses less digits than its factorization.

20311223320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 507780594 (or 507780590 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 19.

Adding to 20311223320 its reverse (2332211302), we get a palindrome (22643434622).

The spelling of 20311223320 in words is "twenty billion, three hundred eleven million, two hundred twenty-three thousand, three hundred twenty".