20320210320 has 160 divisors (see below), whose sum is σ = 63477568128. Its totient is φ = 5377204224.

The previous prime is 20320210289. The next prime is 20320210343. The reversal of 20320210320 is 2301202302.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 20320210320.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 22403307 + ... + 22404213.

Almost surely, 2^20320210320 is an apocalyptic number.

20320210320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20320210320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31738784064).

20320210320 is an abundant number, since it is smaller than the sum of its proper divisors (43157357808).

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

20320210320 is a wasteful number, since it uses less digits than its factorization.

20320210320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1537 (or 1531 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 15.

Adding to 20320210320 its reverse (2301202302), we get a palindrome (22621412622).

The spelling of 20320210320 in words is "twenty billion, three hundred twenty million, two hundred ten thousand, three hundred twenty".