20007645 has 32 divisors (see below), whose sum is σ = 37013760. Its totient is φ = 9039360.

The previous prime is 20007643. The next prime is 20007661. The reversal of 20007645 is 54670002.

It is a happy number.

It is not a de Polignac number, because 20007645 - 2¹ = 20007643 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20007643) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 8275 + ... + 10415.

It is an arithmetic number, because the mean of its divisors is an integer number (1156680).

Almost surely, 2^20007645 is an apocalyptic number.

It is an amenable number.

20007645 is a deficient number, since it is larger than the sum of its proper divisors (17006115).

20007645 is a wasteful number, since it uses less digits than its factorization.

20007645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2245.

The product of its (nonzero) digits is 1680, while the sum is 24.

The square root of 20007645 is about 4472.9906103188. The cubic root of 20007645 is about 271.4763434580.

Adding to 20007645 its reverse (54670002), we get a palindrome (74677647).

The spelling of 20007645 in words is "twenty million, seven thousand, six hundred forty-five".