20345320 has 32 divisors (see below), whose sum is σ = 46033920. Its totient is φ = 8092480.

The previous prime is 20345293. The next prime is 20345357. The reversal of 20345320 is 2354302.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6309 + ... + 8971.

It is an arithmetic number, because the mean of its divisors is an integer number (1438560).

Almost surely, 2^20345320 is an apocalyptic number.

20345320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20345320 is an abundant number, since it is smaller than the sum of its proper divisors (25688600).

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

20345320 is a wasteful number, since it uses less digits than its factorization.

20345320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2865 (or 2861 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 19.

The square root of 20345320 is about 4510.5786768440. The cubic root of 20345320 is about 272.9950935443.

Adding to 20345320 its reverse (2354302), we get a palindrome (22699622).

The spelling of 20345320 in words is "twenty million, three hundred forty-five thousand, three hundred twenty".