20707943 has 6 divisors (see below), whose sum is σ = 21447504. Its totient is φ = 19993064.

The previous prime is 20707937. The next prime is 20707949. The reversal of 20707943 is 34970702.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (20707937) and next prime (20707949).

It is not a de Polignac number, because 20707943 - 2¹² = 20703847 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20707949) 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 5 ways as a sum of consecutive naturals, for example, 11471 + ... + 13152.

It is an arithmetic number, because the mean of its divisors is an integer number (3574584).

Almost surely, 2^20707943 is an apocalyptic number.

20707943 is a deficient number, since it is larger than the sum of its proper divisors (739561).

20707943 is an equidigital number, since it uses as much as digits as its factorization.

20707943 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24681 (or 24652 counting only the distinct ones).

The product of its (nonzero) digits is 10584, while the sum is 32.

The square root of 20707943 is about 4550.5980925588. The cubic root of 20707943 is about 274.6074531515.

The spelling of 20707943 in words is "twenty million, seven hundred seven thousand, nine hundred forty-three".