20316664 has 8 divisors (see below), whose sum is σ = 38093760. Its totient is φ = 10158328.

The previous prime is 20316641. The next prime is 20316671. The reversal of 20316664 is 46661302.

It is a tau number, because it is divible by the number of its divisors (8).

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 as a sum of consecutive naturals, namely, 1269784 + ... + 1269799.

It is an arithmetic number, because the mean of its divisors is an integer number (4761720).

Almost surely, 2^20316664 is an apocalyptic number.

It is an amenable number.

20316664 is a deficient number, since it is larger than the sum of its proper divisors (17777096).

20316664 is a wasteful number, since it uses less digits than its factorization.

20316664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2539589 (or 2539585 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 28.

The square root of 20316664 is about 4507.4010249810. The cubic root of 20316664 is about 272.8668638400.

Adding to 20316664 its reverse (46661302), we get a palindrome (66977966).

The spelling of 20316664 in words is "twenty million, three hundred sixteen thousand, six hundred sixty-four".