20881887813 has 48 divisors (see below), whose sum is σ = 32897404800. Its totient is φ = 12713500800.

The previous prime is 20881887811. The next prime is 20881887847. The reversal of 20881887813 is 31878818802.

It is not a de Polignac number, because 20881887813 - 2¹ = 20881887811 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20881887813.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20881887811) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 3473256 + ... + 3479262.

It is an arithmetic number, because the mean of its divisors is an integer number (685362600).

Almost surely, 2^20881887813 is an apocalyptic number.

It is an amenable number.

20881887813 is a deficient number, since it is larger than the sum of its proper divisors (12015516987).

20881887813 is a wasteful number, since it uses less digits than its factorization.

20881887813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6762 (or 6759 counting only the distinct ones).

The product of its (nonzero) digits is 1376256, while the sum is 54.

The spelling of 20881887813 in words is "twenty billion, eight hundred eighty-one million, eight hundred eighty-seven thousand, eight hundred thirteen".