20851208 has 32 divisors (see below), whose sum is σ = 47035200. Its totient is φ = 8465472.

The previous prime is 20851109. The next prime is 20851211. The reversal of 20851208 is 80215802.

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, 8735 + ... + 10862.

It is an arithmetic number, because the mean of its divisors is an integer number (1469850).

Almost surely, 2^20851208 is an apocalyptic number.

20851208 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

20851208 is an abundant number, since it is smaller than the sum of its proper divisors (26183992).

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

20851208 is a wasteful number, since it uses less digits than its factorization.

20851208 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19629 (or 19625 counting only the distinct ones).

The product of its (nonzero) digits is 1280, while the sum is 26.

The square root of 20851208 is about 4566.3122976862. The cubic root of 20851208 is about 275.2392760443.

The spelling of 20851208 in words is "twenty million, eight hundred fifty-one thousand, two hundred eight".