20707247 has 16 divisors (see below), whose sum is σ = 23587200. Its totient is φ = 18006240.

The previous prime is 20707237. The next prime is 20707273. The reversal of 20707247 is 74270702.

It is a cyclic number.

It is not a de Polignac number, because 20707247 - 2⁴ = 20707231 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (29).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20707237) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 44108 + ... + 44574.

It is an arithmetic number, because the mean of its divisors is an integer number (1474200).

Almost surely, 2^20707247 is an apocalyptic number.

20707247 is a deficient number, since it is larger than the sum of its proper divisors (2879953).

20707247 is a wasteful number, since it uses less digits than its factorization.

20707247 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 646.

The product of its (nonzero) digits is 5488, while the sum is 29.

The square root of 20707247 is about 4550.5216184521. The cubic root of 20707247 is about 274.6043765715.

Adding to 20707247 its reverse (74270702), we get a palindrome (94977949).

The spelling of 20707247 in words is "twenty million, seven hundred seven thousand, two hundred forty-seven".