20828871388 has 24 divisors (see below), whose sum is σ = 39897932480. Its totient is φ = 9455728320.

The previous prime is 20828871377. The next prime is 20828871403. The reversal of 20828871388 is 88317882802.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3280068 + ... + 3286411.

Almost surely, 2^20828871388 is an apocalyptic number.

It is an amenable number.

20828871388 is a deficient number, since it is larger than the sum of its proper divisors (19069061092).

20828871388 is a wasteful number, since it uses less digits than its factorization.

20828871388 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6566557 (or 6566555 counting only the distinct ones).

The product of its (nonzero) digits is 2752512, while the sum is 55.

The spelling of 20828871388 in words is "twenty billion, eight hundred twenty-eight million, eight hundred seventy-one thousand, three hundred eighty-eight".