20989793 has 8 divisors (see below), whose sum is σ = 22934496. Its totient is φ = 19051200.

The previous prime is 20989789. The next prime is 20989799. The reversal of 20989793 is 39798902.

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 20989793 - 2² = 20989789 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20989799) 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, 8633 + ... + 10793.

It is an arithmetic number, because the mean of its divisors is an integer number (2866812).

Almost surely, 2^20989793 is an apocalyptic number.

It is an amenable number.

20989793 is a deficient number, since it is larger than the sum of its proper divisors (1944703).

20989793 is a wasteful number, since it uses less digits than its factorization.

20989793 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3055.

The product of its (nonzero) digits is 244944, while the sum is 47.

The square root of 20989793 is about 4581.4618845954. The cubic root of 20989793 is about 275.8477114433.

The spelling of 20989793 in words is "twenty million, nine hundred eighty-nine thousand, seven hundred ninety-three".