20105456907 has 8 divisors (see below), whose sum is σ = 26808471360. Its totient is φ = 13403040200.

The previous prime is 20105456887. The next prime is 20105456909. The reversal of 20105456907 is 70965450102.

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 20105456907 - 2⁷ = 20105456779 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20105456909) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 63969 + ... + 210482.

It is an arithmetic number, because the mean of its divisors is an integer number (3351058920).

Almost surely, 2^20105456907 is an apocalyptic number.

20105456907 is a deficient number, since it is larger than the sum of its proper divisors (6703014453).

20105456907 is a wasteful number, since it uses less digits than its factorization.

20105456907 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 298873.

The product of its (nonzero) digits is 75600, while the sum is 39.

The spelling of 20105456907 in words is "twenty billion, one hundred five million, four hundred fifty-six thousand, nine hundred seven".