20455717 has 8 divisors (see below), whose sum is σ = 21422016. Its totient is φ = 19495872.

The previous prime is 20455711. The next prime is 20455823. The reversal of 20455717 is 71755402.

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 20455717 - 2¹⁵ = 20422949 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20455711) 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, 5613 + ... + 8509.

It is an arithmetic number, because the mean of its divisors is an integer number (2677752).

Almost surely, 2^20455717 is an apocalyptic number.

It is an amenable number.

20455717 is a deficient number, since it is larger than the sum of its proper divisors (966299).

20455717 is a wasteful number, since it uses less digits than its factorization.

20455717 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3227.

The product of its (nonzero) digits is 9800, while the sum is 31.

The square root of 20455717 is about 4522.7996860352. The cubic root of 20455717 is about 273.4879749890.

The spelling of 20455717 in words is "twenty million, four hundred fifty-five thousand, seven hundred seventeen".