20806410 has 48 divisors (see below), whose sum is σ = 51502176. Its totient is φ = 5376672.

The previous prime is 20806397. The next prime is 20806417. The reversal of 20806410 is 1460802.

It is not an unprimeable number, because it can be changed into a prime (20806417) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 163767 + ... + 163893.

It is an arithmetic number, because the mean of its divisors is an integer number (1072962).

Almost surely, 2^20806410 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20806410, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25751088).

20806410 is an abundant number, since it is smaller than the sum of its proper divisors (30695766).

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

20806410 is a wasteful number, since it uses less digits than its factorization.

20806410 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 307 (or 180 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 21.

The square root of 20806410 is about 4561.4043890013. The cubic root of 20806410 is about 275.0420211269.

The spelling of 20806410 in words is "twenty million, eight hundred six thousand, four hundred ten".