20705797 has 8 divisors (see below), whose sum is σ = 24480000. Its totient is φ = 17135664.

The previous prime is 20705791. The next prime is 20705809. The reversal of 20705797 is 79750702.

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

It is a de Polignac number, because none of the positive numbers 2^k-20705797 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 (20705791) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 50797 + ... + 51202.

It is an arithmetic number, because the mean of its divisors is an integer number (3060000).

Almost surely, 2^20705797 is an apocalyptic number.

It is an amenable number.

20705797 is a deficient number, since it is larger than the sum of its proper divisors (3774203).

20705797 is a wasteful number, since it uses less digits than its factorization.

20705797 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 102035.

The product of its (nonzero) digits is 30870, while the sum is 37.

The square root of 20705797 is about 4550.3622932685. The cubic root of 20705797 is about 274.5979668084.

The spelling of 20705797 in words is "twenty million, seven hundred five thousand, seven hundred ninety-seven".