20317816 has 16 divisors (see below), whose sum is σ = 38298240. Its totient is φ = 10104960.

The previous prime is 20317807. The next prime is 20317849. The reversal of 20317816 is 61871302.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5121 + ... + 8176.

It is an arithmetic number, because the mean of its divisors is an integer number (2393640).

Almost surely, 2^20317816 is an apocalyptic number.

It is an amenable number.

20317816 is a deficient number, since it is larger than the sum of its proper divisors (17980424).

20317816 is a wasteful number, since it uses less digits than its factorization.

20317816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13494 (or 13490 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 28.

The square root of 20317816 is about 4507.5288129972. The cubic root of 20317816 is about 272.8720211284.

The spelling of 20317816 in words is "twenty million, three hundred seventeen thousand, eight hundred sixteen".