20317678 has 4 divisors (see below), whose sum is σ = 30476520. Its totient is φ = 10158838.

The previous prime is 20317667. The next prime is 20317681. The reversal of 20317678 is 87671302.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5079418 + ... + 5079421.

It is an arithmetic number, because the mean of its divisors is an integer number (7619130).

Almost surely, 2^20317678 is an apocalyptic number.

20317678 is a deficient number, since it is larger than the sum of its proper divisors (10158842).

20317678 is a wasteful number, since it uses less digits than its factorization.

20317678 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10158841.

The product of its (nonzero) digits is 14112, while the sum is 34.

The square root of 20317678 is about 4507.5135052488. The cubic root of 20317678 is about 272.8714033385.

The spelling of 20317678 in words is "twenty million, three hundred seventeen thousand, six hundred seventy-eight".