20105953925 has 12 divisors (see below), whose sum is σ = 24977483556. Its totient is φ = 16055020800.

The previous prime is 20105953921. The next prime is 20105953927. The reversal of 20105953925 is 52935950102.

It can be written as a sum of positive squares in 6 ways, for example, as 317623684 + 19788330241 = 17822^2 + 140671^2 .

It is not a de Polignac number, because 20105953925 - 2² = 20105953921 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20105953921) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 729764 + ... + 756813.

It is an arithmetic number, because the mean of its divisors is an integer number (2081456963).

Almost surely, 2^20105953925 is an apocalyptic number.

20105953925 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20105953925 is a deficient number, since it is larger than the sum of its proper divisors (4871529631).

20105953925 is a wasteful number, since it uses less digits than its factorization.

20105953925 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1487128 (or 1487123 counting only the distinct ones).

The product of its (nonzero) digits is 121500, while the sum is 41.

The spelling of 20105953925 in words is "twenty billion, one hundred five million, nine hundred fifty-three thousand, nine hundred twenty-five".