20749943 has 8 divisors (see below), whose sum is σ = 21772416. Its totient is φ = 19749600.

The previous prime is 20749931. The next prime is 20749961. The reversal of 20749943 is 34994702.

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

It is a cyclic number.

It is not a de Polignac number, because 20749943 - 2⁶ = 20749879 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20749897 and 20749906.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20749913) 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, 3596 + ... + 7377.

It is an arithmetic number, because the mean of its divisors is an integer number (2721552).

Almost surely, 2^20749943 is an apocalyptic number.

20749943 is a deficient number, since it is larger than the sum of its proper divisors (1022473).

20749943 is a wasteful number, since it uses less digits than its factorization.

20749943 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11065.

The product of its (nonzero) digits is 54432, while the sum is 38.

The square root of 20749943 is about 4555.2105330050. The cubic root of 20749943 is about 274.7929813866.

The spelling of 20749943 in words is "twenty million, seven hundred forty-nine thousand, nine hundred forty-three".