20173905 has 12 divisors (see below), whose sum is σ = 34968180. Its totient is φ = 10759392.

The previous prime is 20173873. The next prime is 20173919. The reversal of 20173905 is 50937102.

It can be written as a sum of positive squares in 2 ways, for example, as 14107536 + 6066369 = 3756^2 + 2463^2 .

It is not a de Polignac number, because 20173905 - 2⁵ = 20173873 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 224110 + ... + 224199.

It is an arithmetic number, because the mean of its divisors is an integer number (2914015).

Almost surely, 2^20173905 is an apocalyptic number.

It is an amenable number.

20173905 is a deficient number, since it is larger than the sum of its proper divisors (14794275).

20173905 is a wasteful number, since it uses less digits than its factorization.

20173905 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 448320 (or 448317 counting only the distinct ones).

The product of its (nonzero) digits is 1890, while the sum is 27.

The square root of 20173905 is about 4491.5370420381. The cubic root of 20173905 is about 272.2262436045.

The spelling of 20173905 in words is "twenty million, one hundred seventy-three thousand, nine hundred five".