20102105125 has 8 divisors (see below), whose sum is σ = 25087427352. Its totient is φ = 16081684000.

The previous prime is 20102105117. The next prime is 20102105197. The reversal of 20102105125 is 52150120102.

It can be written as a sum of positive squares in 4 ways, for example, as 3057758209 + 17044346916 = 55297^2 + 130554^2 .

It is not a de Polignac number, because 20102105125 - 2³ = 20102105117 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 80408296 + ... + 80408545.

It is an arithmetic number, because the mean of its divisors is an integer number (3135928419).

Almost surely, 2^20102105125 is an apocalyptic number.

20102105125 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20102105125 is a deficient number, since it is larger than the sum of its proper divisors (4985322227).

20102105125 is an equidigital number, since it uses as much as digits as its factorization.

20102105125 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 160816856 (or 160816846 counting only the distinct ones).

The product of its (nonzero) digits is 200, while the sum is 19.

Adding to 20102105125 its reverse (52150120102), we get a palindrome (72252225227).

The spelling of 20102105125 in words is "twenty billion, one hundred two million, one hundred five thousand, one hundred twenty-five".