20121208 has 16 divisors (see below), whose sum is σ = 37870560. Its totient is φ = 10022400.

The previous prime is 20121193. The next prime is 20121271. The reversal of 20121208 is 80212102.

It is a super-2 number, since 2×20121208² = 809726022758528, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20121191 and 20121200.

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, 2473 + ... + 6808.

It is an arithmetic number, because the mean of its divisors is an integer number (2366910).

Almost surely, 2^20121208 is an apocalyptic number.

It is an amenable number.

20121208 is a deficient number, since it is larger than the sum of its proper divisors (17749352).

20121208 is a wasteful number, since it uses less digits than its factorization.

20121208 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9558 (or 9554 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 16.

The square root of 20121208 is about 4485.6669515246. Note that the first 3 decimals coincide. The cubic root of 20121208 is about 271.9890061877.

The spelling of 20121208 in words is "twenty million, one hundred twenty-one thousand, two hundred eight".