20020806 has 48 divisors (see below), whose sum is σ = 47449584. Its totient is φ = 6063552.

The previous prime is 20020799. The next prime is 20020829. The reversal of 20020806 is 60802002.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

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 23 ways as a sum of consecutive naturals, for example, 15040 + ... + 16316.

It is an arithmetic number, because the mean of its divisors is an integer number (988533).

Almost surely, 2^20020806 is an apocalyptic number.

20020806 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 20020806, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23724792).

20020806 is an abundant number, since it is smaller than the sum of its proper divisors (27428778).

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

20020806 is a wasteful number, since it uses less digits than its factorization.

20020806 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1365 (or 1362 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

The square root of 20020806 is about 4474.4615318494. The cubic root of 20020806 is about 271.5358559931.

Adding to 20020806 its reverse (60802002), we get a palindrome (80822808).

The spelling of 20020806 in words is "twenty million, twenty thousand, eight hundred six".