20871812678 has 8 divisors (see below), whose sum is σ = 31309908480. Its totient is φ = 10435176520.

The previous prime is 20871812659. The next prime is 20871812693. The reversal of 20871812678 is 87621817802.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 328433 + ... + 386796.

It is an arithmetic number, because the mean of its divisors is an integer number (3913738560).

Almost surely, 2^20871812678 is an apocalyptic number.

20871812678 is a deficient number, since it is larger than the sum of its proper divisors (10438095802).

20871812678 is a wasteful number, since it uses less digits than its factorization.

20871812678 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 729822.

The product of its (nonzero) digits is 602112, while the sum is 50.

The spelling of 20871812678 in words is "twenty billion, eight hundred seventy-one million, eight hundred twelve thousand, six hundred seventy-eight".