20317672 has 16 divisors (see below), whose sum is σ = 38982240. Its totient is φ = 9922416.

The previous prime is 20317667. The next prime is 20317681. The reversal of 20317672 is 27671302.

It is a self number, because there is not a number n which added to its sum of digits gives 20317672.

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, 29188 + ... + 29875.

It is an arithmetic number, because the mean of its divisors is an integer number (2436390).

Almost surely, 2^20317672 is an apocalyptic number.

It is an amenable number.

20317672 is a deficient number, since it is larger than the sum of its proper divisors (18664568).

20317672 is a wasteful number, since it uses less digits than its factorization.

20317672 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59112 (or 59108 counting only the distinct ones).

The product of its (nonzero) digits is 3528, while the sum is 28.

The square root of 20317672 is about 4507.5128396933. The cubic root of 20317672 is about 272.8713764780.

Adding to 20317672 its reverse (27671302), we get a palindrome (47988974).

The spelling of 20317672 in words is "twenty million, three hundred seventeen thousand, six hundred seventy-two".