20084387721 has 8 divisors (see below), whose sum is σ = 26790487584. Its totient is φ = 13383939840.

The previous prime is 20084387717. The next prime is 20084387723. The reversal of 20084387721 is 12778348002.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20084387721 - 2² = 20084387717 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (20084387723) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1404696 + ... + 1418921.

It is an arithmetic number, because the mean of its divisors is an integer number (3348810948).

Almost surely, 2^20084387721 is an apocalyptic number.

It is an amenable number.

20084387721 is a deficient number, since it is larger than the sum of its proper divisors (6706099863).

20084387721 is a wasteful number, since it uses less digits than its factorization.

20084387721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2825991.

The product of its (nonzero) digits is 150528, while the sum is 42.

The spelling of 20084387721 in words is "twenty billion, eighty-four million, three hundred eighty-seven thousand, seven hundred twenty-one".