20828871387 has 32 divisors (see below), whose sum is σ = 31933736960. Its totient is φ = 13403918880.

The previous prime is 20828871377. The next prime is 20828871403. The reversal of 20828871387 is 78317882802.

It is not a de Polignac number, because 20828871387 - 2²⁰ = 20827822811 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20828871307) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 300948 + ... + 363630.

It is an arithmetic number, because the mean of its divisors is an integer number (997929280).

Almost surely, 2^20828871387 is an apocalyptic number.

20828871387 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

20828871387 is a deficient number, since it is larger than the sum of its proper divisors (11104865573).

20828871387 is a wasteful number, since it uses less digits than its factorization.

20828871387 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63120 (or 63114 counting only the distinct ones).

The product of its (nonzero) digits is 2408448, while the sum is 54.

The spelling of 20828871387 in words is "twenty billion, eight hundred twenty-eight million, eight hundred seventy-one thousand, three hundred eighty-seven".