20803147 has 4 divisors (see below), whose sum is σ = 20912256. Its totient is φ = 20694040.

The previous prime is 20803141. The next prime is 20803163. The reversal of 20803147 is 74130802.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 74130802 = 2 ⋅37065401.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20803147 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20803141) 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, 54268 + ... + 54649.

It is an arithmetic number, because the mean of its divisors is an integer number (5228064).

Almost surely, 2^20803147 is an apocalyptic number.

20803147 is a deficient number, since it is larger than the sum of its proper divisors (109109).

20803147 is a wasteful number, since it uses less digits than its factorization.

20803147 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 109108.

The product of its (nonzero) digits is 1344, while the sum is 25.

The square root of 20803147 is about 4561.0467000459. The cubic root of 20803147 is about 275.0276424004.

Adding to 20803147 its reverse (74130802), we get a palindrome (94933949).

The spelling of 20803147 in words is "twenty million, eight hundred three thousand, one hundred forty-seven".