20685103755 has 32 divisors (see below), whose sum is σ = 33292416000. Its totient is φ = 10966741632.

The previous prime is 20685103739. The next prime is 20685103757. The reversal of 20685103755 is 55730158602.

It is not a de Polignac number, because 20685103755 - 2⁴ = 20685103739 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20685103757) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4316901 + ... + 4321689.

It is an arithmetic number, because the mean of its divisors is an integer number (1040388000).

Almost surely, 2^20685103755 is an apocalyptic number.

20685103755 is a deficient number, since it is larger than the sum of its proper divisors (12607312245).

20685103755 is a wasteful number, since it uses less digits than its factorization.

20685103755 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6443.

The product of its (nonzero) digits is 252000, while the sum is 42.

The spelling of 20685103755 in words is "twenty billion, six hundred eighty-five million, one hundred three thousand, seven hundred fifty-five".