20676840 has 32 divisors (see below), whose sum is σ = 62030880. Its totient is φ = 5513792.

The previous prime is 20676809. The next prime is 20676847. The reversal of 20676840 is 4867602.

It is not an unprimeable number, because it can be changed into a prime (20676847) 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 7 ways as a sum of consecutive naturals, for example, 86034 + ... + 86273.

It is an arithmetic number, because the mean of its divisors is an integer number (1938465).

Almost surely, 2^20676840 is an apocalyptic number.

20676840 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20676840 is an abundant number, since it is smaller than the sum of its proper divisors (41354040).

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

20676840 is a wasteful number, since it uses less digits than its factorization.

20676840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 172321 (or 172317 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 33.

The square root of 20676840 is about 4547.1793454844. The cubic root of 20676840 is about 274.4698989226.

The spelling of 20676840 in words is "twenty million, six hundred seventy-six thousand, eight hundred forty".