20646127 has 4 divisors (see below), whose sum is σ = 20760376. Its totient is φ = 20531880.

The previous prime is 20646107. The next prime is 20646137. The reversal of 20646127 is 72164602.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 72164602 = 2 ⋅36082301.

It is a cyclic number.

It is not a de Polignac number, because 20646127 - 2¹¹ = 20644079 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20646095 and 20646104.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20646107) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 56853 + ... + 57214.

It is an arithmetic number, because the mean of its divisors is an integer number (5190094).

Almost surely, 2^20646127 is an apocalyptic number.

20646127 is a deficient number, since it is larger than the sum of its proper divisors (114249).

20646127 is a wasteful number, since it uses less digits than its factorization.

20646127 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 114248.

The product of its (nonzero) digits is 4032, while the sum is 28.

The square root of 20646127 is about 4543.8009419428. The cubic root of 20646127 is about 274.3339340576. Note that the first 3 decimals are identical.

The spelling of 20646127 in words is "twenty million, six hundred forty-six thousand, one hundred twenty-seven".