20854317 has 16 divisors (see below), whose sum is σ = 30850560. Its totient is φ = 12423600.

The previous prime is 20854313. The next prime is 20854319. The reversal of 20854317 is 71345802.

It is not a de Polignac number, because 20854317 - 2² = 20854313 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20854313) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3409 + ... + 7302.

It is an arithmetic number, because the mean of its divisors is an integer number (1928160).

Almost surely, 2^20854317 is an apocalyptic number.

It is an amenable number.

20854317 is a deficient number, since it is larger than the sum of its proper divisors (9996243).

20854317 is a wasteful number, since it uses less digits than its factorization.

20854317 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10784.

The product of its (nonzero) digits is 6720, while the sum is 30.

The square root of 20854317 is about 4566.6527128741. The cubic root of 20854317 is about 275.2529551300.

The spelling of 20854317 in words is "twenty million, eight hundred fifty-four thousand, three hundred seventeen".