20871851432 has 16 divisors (see below), whose sum is σ = 39180292800. Its totient is φ = 10423773360.

The previous prime is 20871851417. The next prime is 20871851447. The reversal of 20871851432 is 23415817802.

It is an interprime number because it is at equal distance from previous prime (20871851417) and next prime (20871851447).

It is a self number, because there is not a number n which added to its sum of digits gives 20871851432.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1511744 + ... + 1525487.

It is an arithmetic number, because the mean of its divisors is an integer number (2448768300).

Almost surely, 2^20871851432 is an apocalyptic number.

It is an amenable number.

20871851432 is a deficient number, since it is larger than the sum of its proper divisors (18308441368).

20871851432 is a wasteful number, since it uses less digits than its factorization.

20871851432 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3038096 (or 3038092 counting only the distinct ones).

The product of its (nonzero) digits is 107520, while the sum is 41.

The spelling of 20871851432 in words is "twenty billion, eight hundred seventy-one million, eight hundred fifty-one thousand, four hundred thirty-two".