20874865284 has 288 divisors, whose sum is σ = 69940765440. Its totient is φ = 5092982784.

The previous prime is 20874865259. The next prime is 20874865303. The reversal of 20874865284 is 48256847802.

20874865284 is a `hidden beast` number, since 2 + 0 + 87 + 486 + 5 + 2 + 84 = 666.

It is a self number, because there is not a number n which added to its sum of digits gives 20874865284.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 3282652 + ... + 3289004.

It is an arithmetic number, because the mean of its divisors is an integer number (242849880).

Almost surely, 2^20874865284 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20874865284, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34970382720).

20874865284 is an abundant number, since it is smaller than the sum of its proper divisors (49065900156).

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

20874865284 is a wasteful number, since it uses less digits than its factorization.

20874865284 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6459 (or 6454 counting only the distinct ones).

The product of its (nonzero) digits is 6881280, while the sum is 54.

The spelling of 20874865284 in words is "twenty billion, eight hundred seventy-four million, eight hundred sixty-five thousand, two hundred eighty-four".