20009908 has 12 divisors (see below), whose sum is σ = 36540000. Its totient is φ = 9569912.

The previous prime is 20009887. The next prime is 20009917. The reversal of 20009908 is 80990002.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 108658 + ... + 108841.

It is an arithmetic number, because the mean of its divisors is an integer number (3045000).

Almost surely, 2^20009908 is an apocalyptic number.

It is an amenable number.

20009908 is a deficient number, since it is larger than the sum of its proper divisors (16530092).

20009908 is a wasteful number, since it uses less digits than its factorization.

20009908 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 217526 (or 217524 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 28.

The square root of 20009908 is about 4473.2435659150. The cubic root of 20009908 is about 271.4865783425.

The spelling of 20009908 in words is "twenty million, nine thousand, nine hundred eight".