20676820 has 12 divisors (see below), whose sum is σ = 43421364. Its totient is φ = 8270720.

The previous prime is 20676809. The next prime is 20676847. The reversal of 20676820 is 2867602.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 11410884 + 9265936 = 3378^2 + 3044^2 .

It is a congruent number.

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 3 ways as a sum of consecutive naturals, for example, 516901 + ... + 516940.

It is an arithmetic number, because the mean of its divisors is an integer number (3618447).

Almost surely, 2^20676820 is an apocalyptic number.

20676820 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20676820 is an abundant number, since it is smaller than the sum of its proper divisors (22744544).

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

20676820 is a wasteful number, since it uses less digits than its factorization.

20676820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1033850 (or 1033848 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 31.

The square root of 20676820 is about 4547.1771463184. The cubic root of 20676820 is about 274.4698104274.

The spelling of 20676820 in words is "twenty million, six hundred seventy-six thousand, eight hundred twenty".