20662105127 has 4 divisors (see below), whose sum is σ = 20687646240. Its totient is φ = 20636564016.

The previous prime is 20662105117. The next prime is 20662105147. The reversal of 20662105127 is 72150126602.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 72150126602 = 2 ⋅36075063301.

It is a cyclic number.

It is not a de Polignac number, because 20662105127 - 2¹⁰ = 20662104103 is a prime.

It is a super-2 number, since 2×20662105127² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20662105093 and 20662105102.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20662105117) 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 3 ways as a sum of consecutive naturals, for example, 12769343 + ... + 12770960.

It is an arithmetic number, because the mean of its divisors is an integer number (5171911560).

Almost surely, 2^20662105127 is an apocalyptic number.

20662105127 is a deficient number, since it is larger than the sum of its proper divisors (25541113).

20662105127 is an equidigital number, since it uses as much as digits as its factorization.

20662105127 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25541112.

The product of its (nonzero) digits is 10080, while the sum is 32.

The spelling of 20662105127 in words is "twenty billion, six hundred sixty-two million, one hundred five thousand, one hundred twenty-seven".