20717316 has 24 divisors (see below), whose sum is σ = 53711840. Its totient is φ = 6905736.

The previous prime is 20717261. The next prime is 20717377. The reversal of 20717316 is 61371702.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a self number, because there is not a number n which added to its sum of digits gives 20717316.

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 7 ways as a sum of consecutive naturals, for example, 95806 + ... + 96021.

Almost surely, 2^20717316 is an apocalyptic number.

It is an amenable number.

20717316 is an abundant number, since it is smaller than the sum of its proper divisors (32994524).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20717316 is a wasteful number, since it uses less digits than its factorization.

20717316 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 191840 (or 191832 counting only the distinct ones).

The product of its (nonzero) digits is 1764, while the sum is 27.

The square root of 20717316 is about 4551.6278406741. The cubic root of 20717316 is about 274.6488785990.

The spelling of 20717316 in words is "twenty million, seven hundred seventeen thousand, three hundred sixteen".