20673905 has 16 divisors (see below), whose sum is σ = 28715520. Its totient is φ = 13995072.

The previous prime is 20673893. The next prime is 20673907. The reversal of 20673905 is 50937602.

It is not a de Polignac number, because 20673905 - 2¹⁰ = 20672881 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20673907) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 974 + ... + 6503.

It is an arithmetic number, because the mean of its divisors is an integer number (1794720).

Almost surely, 2^20673905 is an apocalyptic number.

It is an amenable number.

20673905 is a deficient number, since it is larger than the sum of its proper divisors (8041615).

20673905 is an equidigital number, since it uses as much as digits as its factorization.

20673905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7568.

The product of its (nonzero) digits is 11340, while the sum is 32.

The square root of 20673905 is about 4546.8566064920. The cubic root of 20673905 is about 274.4569116500.

The spelling of 20673905 in words is "twenty million, six hundred seventy-three thousand, nine hundred five".