20871851448 has 48 divisors (see below), whose sum is σ = 60698755080. Its totient is φ = 5963385792.

The previous prime is 20871851447. The next prime is 20871851471. The reversal of 20871851448 is 84415817802.

It is a junction number, because it is equal to n+sod(n) for n = 20871851397 and 20871851406.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20871851447) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8872911 + ... + 8875262.

Almost surely, 2^20871851448 is an apocalyptic number.

20871851448 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

20871851448 is an abundant number, since it is smaller than the sum of its proper divisors (39826903632).

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

20871851448 is a wasteful number, since it uses less digits than its factorization.

20871851448 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17748196 (or 17748185 counting only the distinct ones).

The product of its (nonzero) digits is 573440, while the sum is 48.

The spelling of 20871851448 in words is "twenty billion, eight hundred seventy-one million, eight hundred fifty-one thousand, four hundred forty-eight".