20102105555 has 16 divisors (see below), whose sum is σ = 27570938304.
Its totient is φ = 13783132800.
The previous prime is 20102105509. The next prime is 20102105591. The reversal of 20102105555 is 55550120102.
It is not a de Polignac number, because 20102105555 - 224 = 20085328339 is a prime.
It is an unprimeable number.
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 15 ways as a sum of consecutive naturals, for example, 689249 + ... + 717821.
It is an arithmetic number, because the mean of its divisors is an integer number (1723183644).
Almost surely, 220102105555 is an apocalyptic number.
20102105555 is a deficient number, since it is larger than the sum of its proper divisors (7468832749).
20102105555 is a wasteful number, since it uses less digits than its factorization.
20102105555 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 48686.
The product of its (nonzero) digits is 2500, while the sum is 26.
Adding to 20102105555 its reverse (55550120102), we get a palindrome (75652225657).
The spelling of 20102105555 in words is "twenty billion, one hundred two million, one hundred five thousand, five hundred fifty-five".