20645027 has 8 divisors (see below), whose sum is σ = 22280160. Its totient is φ = 19016640.

The previous prime is 20644997. The next prime is 20645033. The reversal of 20645027 is 72054602.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20645027 - 2¹⁰ = 20644003 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20644987 and 20645005.

It is not an unprimeable number, because it can be changed into a prime (20645047) 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 7 ways as a sum of consecutive naturals, for example, 6002 + ... + 8792.

It is an arithmetic number, because the mean of its divisors is an integer number (2785020).

Almost surely, 2^20645027 is an apocalyptic number.

20645027 is a deficient number, since it is larger than the sum of its proper divisors (1635133).

20645027 is a wasteful number, since it uses less digits than its factorization.

20645027 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3373.

The product of its (nonzero) digits is 3360, while the sum is 26.

The square root of 20645027 is about 4543.6798962955. The cubic root of 20645027 is about 274.3290619140.

Adding to 20645027 its reverse (72054602), we get a palindrome (92699629).

The spelling of 20645027 in words is "twenty million, six hundred forty-five thousand, twenty-seven".