20111208 has 64 divisors (see below), whose sum is σ = 54949440. Its totient is φ = 6096384.

The previous prime is 20111183. The next prime is 20111213. The reversal of 20111208 is 80211102.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 22335 + ... + 23217.

It is an arithmetic number, because the mean of its divisors is an integer number (858585).

Almost surely, 2^20111208 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20111208, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27474720).

20111208 is an abundant number, since it is smaller than the sum of its proper divisors (34838232).

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

20111208 is a wasteful number, since it uses less digits than its factorization.

20111208 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 978 (or 974 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 15.

The square root of 20111208 is about 4484.5521515532. The cubic root of 20111208 is about 271.9439402922.

The spelling of 20111208 in words is "twenty million, one hundred eleven thousand, two hundred eight".