20007943 has 8 divisors (see below), whose sum is σ = 20571408. Its totient is φ = 19449024.

The previous prime is 20007919. The next prime is 20007971. The reversal of 20007943 is 34970002.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20007943 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 (20007973) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9021 + ... + 11017.

It is an arithmetic number, because the mean of its divisors is an integer number (2571426).

Almost surely, 2^20007943 is an apocalyptic number.

20007943 is a deficient number, since it is larger than the sum of its proper divisors (563465).

20007943 is a wasteful number, since it uses less digits than its factorization.

20007943 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2273.

The product of its (nonzero) digits is 1512, while the sum is 25.

The square root of 20007943 is about 4473.0239212416. The cubic root of 20007943 is about 271.4776912686.

Adding to 20007943 its reverse (34970002), we get a palindrome (54977945).

The spelling of 20007943 in words is "twenty million, seven thousand, nine hundred forty-three".