20707147 has 4 divisors (see below), whose sum is σ = 20739136. Its totient is φ = 20675160.

The previous prime is 20707133. The next prime is 20707151. The reversal of 20707147 is 74170702.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 74170702 = 2 ⋅37085351.

It is a cyclic number.

It is not a de Polignac number, because 20707147 - 2⁷ = 20707019 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20707117) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15003 + ... + 16324.

It is an arithmetic number, because the mean of its divisors is an integer number (5184784).

Almost surely, 2^20707147 is an apocalyptic number.

20707147 is a deficient number, since it is larger than the sum of its proper divisors (31989).

20707147 is an equidigital number, since it uses as much as digits as its factorization.

20707147 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31988.

The product of its (nonzero) digits is 2744, while the sum is 28.

The square root of 20707147 is about 4550.5106306875. The cubic root of 20707147 is about 274.6039345285.

Adding to 20707147 its reverse (74170702), we get a palindrome (94877849).

It can be divided in two parts, 2070714 and 7, that added together give a square (2070721 = 1439²).

The spelling of 20707147 in words is "twenty million, seven hundred seven thousand, one hundred forty-seven".