20021310320 has 80 divisors (see below), whose sum is σ = 52419502080. Its totient is φ = 7045612800.

The previous prime is 20021310311. The next prime is 20021310341. The reversal of 20021310320 is 2301312002.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (80).

It is a junction number, because it is equal to n+sod(n) for n = 20021310295 and 20021310304.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 339680 + ... + 394239.

It is an arithmetic number, because the mean of its divisors is an integer number (655243776).

Almost surely, 2^20021310320 is an apocalyptic number.

20021310320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20021310320 is an abundant number, since it is smaller than the sum of its proper divisors (32398191760).

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

20021310320 is a wasteful number, since it uses less digits than its factorization.

20021310320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 733974 (or 733968 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 14.

Adding to 20021310320 its reverse (2301312002), we get a palindrome (22322622322).

The spelling of 20021310320 in words is "twenty billion, twenty-one million, three hundred ten thousand, three hundred twenty".