20102105557 has 8 divisors (see below), whose sum is σ = 20434265280. Its totient is φ = 19771480800.

The previous prime is 20102105509. The next prime is 20102105591. The reversal of 20102105557 is 75550120102.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20102105557 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20102105657) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 357319 + ... + 409732.

It is an arithmetic number, because the mean of its divisors is an integer number (2554283160).

Almost surely, 2^20102105557 is an apocalyptic number.

It is an amenable number.

20102105557 is a deficient number, since it is larger than the sum of its proper divisors (332159723).

20102105557 is an equidigital number, since it uses as much as digits as its factorization.

20102105557 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 767483.

The product of its (nonzero) digits is 3500, while the sum is 28.

Adding to 20102105557 its reverse (75550120102), we get a palindrome (95652225659).

The spelling of 20102105557 in words is "twenty billion, one hundred two million, one hundred five thousand, five hundred fifty-seven".