20707047 has 12 divisors (see below), whose sum is σ = 30475224. Its totient is φ = 13543920.

The previous prime is 20707033. The next prime is 20707051. The reversal of 20707047 is 74070702.

It is a happy number.

It is not a de Polignac number, because 20707047 - 2¹⁹ = 20182759 is a prime.

It is a Smith number, since the sum of its digits (27) coincides with the sum of the digits of its prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 20707047.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20707067) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 21229 + ... + 22182.

It is an arithmetic number, because the mean of its divisors is an integer number (2539602).

Almost surely, 2^20707047 is an apocalyptic number.

20707047 is a deficient number, since it is larger than the sum of its proper divisors (9768177).

20707047 is a wasteful number, since it uses less digits than its factorization.

20707047 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43470 (or 43467 counting only the distinct ones).

The product of its (nonzero) digits is 2744, while the sum is 27.

The square root of 20707047 is about 4550.4996428964. The cubic root of 20707047 is about 274.6034924840.

Adding to 20707047 its reverse (74070702), we get a palindrome (94777749).

The spelling of 20707047 in words is "twenty million, seven hundred seven thousand, forty-seven".