20638127 has 2 divisors, whose sum is σ = 20638128. Its totient is φ = 20638126.

The previous prime is 20638109. The next prime is 20638171. The reversal of 20638127 is 72183602.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20638127 is a prime.

It is a super-3 number, since 3×20638127³ (a number of 23 digits) contains 333 as substring.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20638127.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20608127) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10319063 + 10319064.

It is an arithmetic number, because the mean of its divisors is an integer number (10319064).

Almost surely, 2^20638127 is an apocalyptic number.

20638127 is a deficient number, since it is larger than the sum of its proper divisors (1).

20638127 is an equidigital number, since it uses as much as digits as its factorization.

20638127 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4032, while the sum is 29.

The square root of 20638127 is about 4542.9205363951. The cubic root of 20638127 is about 274.2984963377.

The spelling of 20638127 in words is "twenty million, six hundred thirty-eight thousand, one hundred twenty-seven".