20806016 has 64 divisors (see below), whose sum is σ = 51701760. Its totient is φ = 8102400.

The previous prime is 20806003. The next prime is 20806039. The reversal of 20806016 is 61060802.

It is a tau number, because it is divible by the number of its divisors (64).

It is a junction number, because it is equal to n+sod(n) for n = 20805982 and 20806000.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8801 + ... + 10911.

It is an arithmetic number, because the mean of its divisors is an integer number (807840).

Almost surely, 2^20806016 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20806016, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25850880).

20806016 is an abundant number, since it is smaller than the sum of its proper divisors (30895744).

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

20806016 is a wasteful number, since it uses less digits than its factorization.

20806016 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2143 (or 2131 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 23.

The square root of 20806016 is about 4561.3612003436. The cubic root of 20806016 is about 275.0402850074.

Adding to 20806016 its reverse (61060802), we get a palindrome (81866818).

The spelling of 20806016 in words is "twenty million, eight hundred six thousand, sixteen".