20686736821284 has 36 divisors (see below), whose sum is σ = 52291617313936. Its totient is φ = 6895559993328.

The previous prime is 20686736821259. The next prime is 20686736821301. The reversal of 20686736821284 is 48212863768602.

20686736821284 is a `hidden beast` number, since 206 + 8 + 6 + 73 + 6 + 82 + 1 + 284 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 19977687 + ... + 20987649.

Almost surely, 2^{20686736821284} is an apocalyptic number.

It is an amenable number.

20686736821284 is an abundant number, since it is smaller than the sum of its proper divisors (31604880492652).

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

20686736821284 is a wasteful number, since it uses less digits than its factorization.

20686736821284 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1578936 (or 1578931 counting only the distinct ones).

The product of its (nonzero) digits is 74317824, while the sum is 63.

The spelling of 20686736821284 in words is "twenty trillion, six hundred eighty-six billion, seven hundred thirty-six million, eight hundred twenty-one thousand, two hundred eighty-four".