20105903 has 8 divisors (see below), whose sum is σ = 20899200. Its totient is φ = 19319328.

The previous prime is 20105873. The next prime is 20105927. The reversal of 20105903 is 30950102.

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 20105903 - 2⁸ = 20105647 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 (20105303) 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, 4913 + ... + 8021.

It is an arithmetic number, because the mean of its divisors is an integer number (2612400).

Almost surely, 2^20105903 is an apocalyptic number.

20105903 is a deficient number, since it is larger than the sum of its proper divisors (793297).

20105903 is a wasteful number, since it uses less digits than its factorization.

20105903 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3361.

The product of its (nonzero) digits is 270, while the sum is 20.

The square root of 20105903 is about 4483.9606376506. The cubic root of 20105903 is about 271.9200267698.

The spelling of 20105903 in words is "twenty million, one hundred five thousand, nine hundred three".