20320620 has 48 divisors (see below), whose sum is σ = 57304800. Its totient is φ = 5380096.

The previous prime is 20320609. The next prime is 20320669. The reversal of 20320620 is 2602302.

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 20320620.

It is an unprimeable number.

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, 7804 + ... + 10076.

It is an arithmetic number, because the mean of its divisors is an integer number (1193850).

Almost surely, 2^20320620 is an apocalyptic number.

20320620 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 20320620, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28652400).

20320620 is an abundant number, since it is smaller than the sum of its proper divisors (36984180).

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

20320620 is a wasteful number, since it uses less digits than its factorization.

20320620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2434 (or 2432 counting only the distinct ones).

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

The square root of 20320620 is about 4507.8398374388. The cubic root of 20320620 is about 272.8845732969.

Adding to 20320620 its reverse (2602302), we get a palindrome (22922922).

The spelling of 20320620 in words is "twenty million, three hundred twenty thousand, six hundred twenty".