20105907 has 8 divisors (see below), whose sum is σ = 26920080. Its totient is φ = 13347840.

The previous prime is 20105873. The next prime is 20105927. The reversal of 20105907 is 70950102.

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

It is not a de Polignac number, because 20105907 - 2⁷ = 20105779 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20105927) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 13182 + ... + 14627.

It is an arithmetic number, because the mean of its divisors is an integer number (3365010).

Almost surely, 2^20105907 is an apocalyptic number.

20105907 is a deficient number, since it is larger than the sum of its proper divisors (6814173).

20105907 is a wasteful number, since it uses less digits than its factorization.

20105907 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28053.

The product of its (nonzero) digits is 630, while the sum is 24.

The square root of 20105907 is about 4483.9610836848. The cubic root of 20105907 is about 271.9200448023.

It can be divided in two parts, 20105 and 907, that added together give a palindrome (21012).

The spelling of 20105907 in words is "twenty million, one hundred five thousand, nine hundred seven".