20839903 has 8 divisors (see below), whose sum is σ = 25070720. Its totient is φ = 16922520.

The previous prime is 20839901. The next prime is 20839913. The reversal of 20839903 is 30993802.

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

It is a cyclic number.

It is not a de Polignac number, because 20839903 - 2¹ = 20839901 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20839901) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 78213 + ... + 78478.

It is an arithmetic number, because the mean of its divisors is an integer number (3133840).

Almost surely, 2^20839903 is an apocalyptic number.

20839903 is a deficient number, since it is larger than the sum of its proper divisors (4230817).

20839903 is a wasteful number, since it uses less digits than its factorization.

20839903 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 156717.

The product of its (nonzero) digits is 11664, while the sum is 34.

The square root of 20839903 is about 4565.0742600751. The cubic root of 20839903 is about 275.1895244500.

The spelling of 20839903 in words is "twenty million, eight hundred thirty-nine thousand, nine hundred three".