20217716 has 12 divisors (see below), whose sum is σ = 35561988. Its totient is φ = 10057152.

The previous prime is 20217679. The next prime is 20217733. The reversal of 20217716 is 61771202.

It can be written as a sum of positive squares in 2 ways, for example, as 14409616 + 5808100 = 3796^2 + 2410^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12041 + ... + 13616.

It is an arithmetic number, because the mean of its divisors is an integer number (2963499).

Almost surely, 2^20217716 is an apocalyptic number.

It is an amenable number.

20217716 is a deficient number, since it is larger than the sum of its proper divisors (15344272).

20217716 is a wasteful number, since it uses less digits than its factorization.

20217716 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25858 (or 25856 counting only the distinct ones).

The product of its (nonzero) digits is 1176, while the sum is 26.

The square root of 20217716 is about 4496.4114580407. The cubic root of 20217716 is about 272.4231626921.

Adding to 20217716 its reverse (61771202), we get a palindrome (81988918).

The spelling of 20217716 in words is "twenty million, two hundred seventeen thousand, seven hundred sixteen".