20868478 has 8 divisors (see below), whose sum is σ = 31337280. Its totient is φ = 10422720.

The previous prime is 20868473. The next prime is 20868499. The reversal of 20868478 is 87486802.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20868473) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3283 + ... + 7246.

It is an arithmetic number, because the mean of its divisors is an integer number (3917160).

Almost surely, 2^20868478 is an apocalyptic number.

20868478 is a deficient number, since it is larger than the sum of its proper divisors (10468802).

20868478 is a wasteful number, since it uses less digits than its factorization.

20868478 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11522.

The product of its (nonzero) digits is 172032, while the sum is 43.

The square root of 20868478 is about 4568.2029289426. The cubic root of 20868478 is about 275.3152439942.

It can be divided in two parts, 208 and 68478, that added together give a palindrome (68686).

The spelling of 20868478 in words is "twenty million, eight hundred sixty-eight thousand, four hundred seventy-eight".