20721674284688 has 40 divisors (see below), whose sum is σ = 43252591032000. Its totient is φ = 9560305931904.

The previous prime is 20721674284603. The next prime is 20721674284693. The reversal of 20721674284688 is 88648247612702.

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, 17894228 + ... + 19017011.

It is an arithmetic number, because the mean of its divisors is an integer number (1081314775800).

Almost surely, 2^{20721674284688} is an apocalyptic number.

It is an amenable number.

20721674284688 is an abundant number, since it is smaller than the sum of its proper divisors (22530916747312).

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

20721674284688 is a wasteful number, since it uses less digits than its factorization.

20721674284688 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36913959 (or 36913953 counting only the distinct ones).

The product of its (nonzero) digits is 115605504, while the sum is 65.

The spelling of 20721674284688 in words is "twenty trillion, seven hundred twenty-one billion, six hundred seventy-four million, two hundred eighty-four thousand, six hundred eighty-eight".