20009838 has 8 divisors (see below), whose sum is σ = 40019688. Its totient is φ = 6669944.

The previous prime is 20009819. The next prime is 20009863. The reversal of 20009838 is 83890002.

It is a sphenic number, since it is the product of 3 distinct primes.

20009838 is an admirable number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1667481 + ... + 1667492.

It is an arithmetic number, because the mean of its divisors is an integer number (5002461).

Almost surely, 2^20009838 is an apocalyptic number.

20009838 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

20009838 is a wasteful number, since it uses less digits than its factorization.

20009838 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3334978.

The product of its (nonzero) digits is 3456, while the sum is 30.

The square root of 20009838 is about 4473.2357416081. The cubic root of 20009838 is about 271.4862617646.

The spelling of 20009838 in words is "twenty million, nine thousand, eight hundred thirty-eight".