20006745 has 48 divisors (see below), whose sum is σ = 35903616. Its totient is φ = 9504000.

The previous prime is 20006743. The next prime is 20006797. The reversal of 20006745 is 54760002.

It is a happy number.

It is not a de Polignac number, because 20006745 - 2¹ = 20006743 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20006741) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 132420 + ... + 132570.

It is an arithmetic number, because the mean of its divisors is an integer number (747992).

Almost surely, 2^20006745 is an apocalyptic number.

It is an amenable number.

20006745 is a deficient number, since it is larger than the sum of its proper divisors (15896871).

20006745 is a wasteful number, since it uses less digits than its factorization.

20006745 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 254 (or 243 counting only the distinct ones).

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

The square root of 20006745 is about 4472.8900053545. The cubic root of 20006745 is about 271.4722728078.

Adding to 20006745 its reverse (54760002), we get a palindrome (74766747).

The spelling of 20006745 in words is "twenty million, six thousand, seven hundred forty-five".