20351320 has 64 divisors (see below), whose sum is σ = 52151040. Its totient is φ = 7075200.

The previous prime is 20351267. The next prime is 20351323. The reversal of 20351320 is 2315302.

It is a junction number, because it is equal to n+sod(n) for n = 20351294 and 20351303.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20351323) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9115 + ... + 11125.

It is an arithmetic number, because the mean of its divisors is an integer number (814860).

Almost surely, 2^20351320 is an apocalyptic number.

20351320 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 20351320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26075520).

20351320 is an abundant number, since it is smaller than the sum of its proper divisors (31799720).

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

20351320 is a wasteful number, since it uses less digits than its factorization.

20351320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2056 (or 2052 counting only the distinct ones).

The product of its (nonzero) digits is 180, while the sum is 16.

The square root of 20351320 is about 4511.2437309460. The cubic root of 20351320 is about 273.0219270629.

Adding to 20351320 its reverse (2315302), we get a palindrome (22666622).

The spelling of 20351320 in words is "twenty million, three hundred fifty-one thousand, three hundred twenty".