20315678 has 4 divisors (see below), whose sum is σ = 30473520. Its totient is φ = 10157838.

The previous prime is 20315677. The next prime is 20315699. The reversal of 20315678 is 87651302.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 87651302 = 2 ⋅43825651.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20315671) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5078918 + ... + 5078921.

It is an arithmetic number, because the mean of its divisors is an integer number (7618380).

Almost surely, 2^20315678 is an apocalyptic number.

20315678 is a deficient number, since it is larger than the sum of its proper divisors (10157842).

20315678 is a wasteful number, since it uses less digits than its factorization.

20315678 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10157841.

The product of its (nonzero) digits is 10080, while the sum is 32.

The square root of 20315678 is about 4507.2916479855. The cubic root of 20315678 is about 272.8624495477.

The spelling of 20315678 in words is "twenty million, three hundred fifteen thousand, six hundred seventy-eight".