20616330 has 64 divisors (see below), whose sum is σ = 59535360. Its totient is φ = 4463424.

The previous prime is 20616313. The next prime is 20616331. The reversal of 20616330 is 3361602.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a junction number, because it is equal to n+sod(n) for n = 20616297 and 20616306.

It is not an unprimeable number, because it can be changed into a prime (20616331) 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 31 ways as a sum of consecutive naturals, for example, 1407 + ... + 6573.

It is an arithmetic number, because the mean of its divisors is an integer number (930240).

Almost surely, 2^20616330 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20616330, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29767680).

20616330 is an abundant number, since it is smaller than the sum of its proper divisors (38919030).

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

20616330 is a wasteful number, since it uses less digits than its factorization.

20616330 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5203.

The product of its (nonzero) digits is 648, while the sum is 21.

The square root of 20616330 is about 4540.5208952278. The cubic root of 20616330 is about 274.2018953488.

Adding to 20616330 its reverse (3361602), we get a palindrome (23977932).

The spelling of 20616330 in words is "twenty million, six hundred sixteen thousand, three hundred thirty".