20645127 has 12 divisors (see below), whose sum is σ = 29887000. Its totient is φ = 13732848.

The previous prime is 20645111. The next prime is 20645137. The reversal of 20645127 is 72154602.

20645127 is a `hidden beast` number, since 2 + 0 + 645 + 12 + 7 = 666.

It is not a de Polignac number, because 20645127 - 2⁴ = 20645111 is a prime.

It is a super-2 number, since 2×20645127² = 852442537692258, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20645127.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20645137) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2193 + ... + 6789.

Almost surely, 2^20645127 is an apocalyptic number.

20645127 is a deficient number, since it is larger than the sum of its proper divisors (9241873).

20645127 is a wasteful number, since it uses less digits than its factorization.

20645127 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5102 (or 5099 counting only the distinct ones).

The product of its (nonzero) digits is 3360, while the sum is 27.

The square root of 20645127 is about 4543.6909005785. The cubic root of 20645127 is about 274.3295048433.

Adding to 20645127 its reverse (72154602), we get a palindrome (92799729).

The spelling of 20645127 in words is "twenty million, six hundred forty-five thousand, one hundred twenty-seven".