20996743 has 8 divisors (see below), whose sum is σ = 21490560. Its totient is φ = 20507640.

The previous prime is 20996741. The next prime is 20996753. The reversal of 20996743 is 34769902.

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 20996743 - 2¹ = 20996741 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20996696 and 20996705.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20996741) 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, 8788 + ... + 10918.

It is an arithmetic number, because the mean of its divisors is an integer number (2686320).

Almost surely, 2^20996743 is an apocalyptic number.

20996743 is a deficient number, since it is larger than the sum of its proper divisors (493817).

20996743 is a wasteful number, since it uses less digits than its factorization.

20996743 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2357.

The product of its (nonzero) digits is 81648, while the sum is 40.

The square root of 20996743 is about 4582.2203133416. The cubic root of 20996743 is about 275.8781537006.

The spelling of 20996743 in words is "twenty million, nine hundred ninety-six thousand, seven hundred forty-three".