20200494721 has 8 divisors (see below), whose sum is σ = 22549389984. Its totient is φ = 17937013920.

The previous prime is 20200494719. The next prime is 20200494751. The reversal of 20200494721 is 12749400202.

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 20200494721 - 2¹ = 20200494719 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20200494701) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21353116 + ... + 21354061.

It is an arithmetic number, because the mean of its divisors is an integer number (2818673748).

Almost surely, 2^20200494721 is an apocalyptic number.

It is an amenable number.

20200494721 is a deficient number, since it is larger than the sum of its proper divisors (2348895263).

20200494721 is a wasteful number, since it uses less digits than its factorization.

20200494721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42707231.

The product of its (nonzero) digits is 8064, while the sum is 31.

Adding to 20200494721 its reverse (12749400202), we get a palindrome (32949894923).

The spelling of 20200494721 in words is "twenty billion, two hundred million, four hundred ninety-four thousand, seven hundred twenty-one".