20747707 has 4 divisors (see below), whose sum is σ = 20880016. Its totient is φ = 20615400.

The previous prime is 20747663. The next prime is 20747719. The reversal of 20747707 is 70774702.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20747707 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20747737) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 65919 + ... + 66232.

It is an arithmetic number, because the mean of its divisors is an integer number (5220004).

Almost surely, 2^20747707 is an apocalyptic number.

20747707 is a deficient number, since it is larger than the sum of its proper divisors (132309).

20747707 is a wasteful number, since it uses less digits than its factorization.

20747707 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 132308.

The product of its (nonzero) digits is 19208, while the sum is 34.

The square root of 20747707 is about 4554.9650931703. The cubic root of 20747707 is about 274.7831105293.

The spelling of 20747707 in words is "twenty million, seven hundred forty-seven thousand, seven hundred seven".