20006749 has 12 divisors (see below), whose sum is σ = 24025728. Its totient is φ = 16594200.

The previous prime is 20006743. The next prime is 20006797. The reversal of 20006749 is 94760002.

It is not a de Polignac number, because 20006749 - 2³ = 20006741 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20006741) 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 11 ways as a sum of consecutive naturals, for example, 5067 + ... + 8104.

It is an arithmetic number, because the mean of its divisors is an integer number (2002144).

Almost surely, 2^20006749 is an apocalyptic number.

It is an amenable number.

20006749 is a deficient number, since it is larger than the sum of its proper divisors (4018979).

20006749 is a wasteful number, since it uses less digits than its factorization.

20006749 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13216 (or 13209 counting only the distinct ones).

The product of its (nonzero) digits is 3024, while the sum is 28.

The square root of 20006749 is about 4472.8904524927. The cubic root of 20006749 is about 271.4722908999.

The spelling of 20006749 in words is "twenty million, six thousand, seven hundred forty-nine".