20123102555 has 16 divisors (see below), whose sum is σ = 25611798240. Its totient is φ = 15125663232.

The previous prime is 20123102537. The next prime is 20123102557. The reversal of 20123102555 is 55520132102.

It is not a de Polignac number, because 20123102555 - 2⁶ = 20123102491 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20123102557) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 151760 + ... + 251549.

It is an arithmetic number, because the mean of its divisors is an integer number (1600737390).

Almost surely, 2^20123102555 is an apocalyptic number.

20123102555 is a deficient number, since it is larger than the sum of its proper divisors (5488695685).

20123102555 is a wasteful number, since it uses less digits than its factorization.

20123102555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 403918.

The product of its (nonzero) digits is 3000, while the sum is 26.

Adding to 20123102555 its reverse (55520132102), we get a palindrome (75643234657).

The spelling of 20123102555 in words is "twenty billion, one hundred twenty-three million, one hundred two thousand, five hundred fifty-five".