20684840401 has 8 divisors (see below), whose sum is σ = 21599132544. Its totient is φ = 19771794240.

The previous prime is 20684840399. The next prime is 20684840413. The reversal of 20684840401 is 10404848602.

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

It is a cyclic number.

It is not a de Polignac number, because 20684840401 - 2¹ = 20684840399 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20684840431) 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, 277480 + ... + 344041.

It is an arithmetic number, because the mean of its divisors is an integer number (2699891568).

Almost surely, 2^20684840401 is an apocalyptic number.

It is an amenable number.

20684840401 is a deficient number, since it is larger than the sum of its proper divisors (914292143).

20684840401 is a wasteful number, since it uses less digits than its factorization.

20684840401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 622991.

The product of its (nonzero) digits is 49152, while the sum is 37.

The spelling of 20684840401 in words is "twenty billion, six hundred eighty-four million, eight hundred forty thousand, four hundred one".