20471678 has 4 divisors (see below), whose sum is σ = 30707520. Its totient is φ = 10235838.

The previous prime is 20471663. The next prime is 20471699. The reversal of 20471678 is 87617402.

It is a happy number.

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 polite number, since it can be written as a sum of consecutive naturals, namely, 5117918 + ... + 5117921.

It is an arithmetic number, because the mean of its divisors is an integer number (7676880).

Almost surely, 2^20471678 is an apocalyptic number.

20471678 is a deficient number, since it is larger than the sum of its proper divisors (10235842).

20471678 is a wasteful number, since it uses less digits than its factorization.

20471678 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10235841.

The product of its (nonzero) digits is 18816, while the sum is 35.

The square root of 20471678 is about 4524.5638463834. The cubic root of 20471678 is about 273.5590880626.

The spelling of 20471678 in words is "twenty million, four hundred seventy-one thousand, six hundred seventy-eight".