20871718248 has 32 divisors (see below), whose sum is σ = 52262026560. Its totient is φ = 6946208640.

The previous prime is 20871718237. The next prime is 20871718249. The reversal of 20871718248 is 84281717802.

It is a super-4 number, since 4×20871718248⁴ (a number of 42 digits) contains 4444 as substring.

It is a Smith number, since the sum of its digits (48) coincides with the sum of the digits of its prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 20871718197 and 20871718206.

It is not an unprimeable number, because it can be changed into a prime (20871718249) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 673965 + ... + 704252.

It is an arithmetic number, because the mean of its divisors is an integer number (1633188330).

Almost surely, 2^20871718248 is an apocalyptic number.

It is an amenable number.

20871718248 is an abundant number, since it is smaller than the sum of its proper divisors (31390308312).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20871718248 is a wasteful number, since it uses less digits than its factorization.

20871718248 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1378857 (or 1378853 counting only the distinct ones).

The product of its (nonzero) digits is 401408, while the sum is 48.

The spelling of 20871718248 in words is "twenty billion, eight hundred seventy-one million, seven hundred eighteen thousand, two hundred forty-eight".