20284572673 has 4 divisors (see below), whose sum is σ = 20470669780. Its totient is φ = 20098475568.

The previous prime is 20284572647. The next prime is 20284572701. The reversal of 20284572673 is 37627548202.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 13153107969 + 7131464704 = 114687^2 + 84448^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20284572673 is a prime.

It is a super-2 number, since 2×20284572673² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20284570673) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 93048390 + ... + 93048607.

It is an arithmetic number, because the mean of its divisors is an integer number (5117667445).

Almost surely, 2^20284572673 is an apocalyptic number.

It is an amenable number.

20284572673 is a deficient number, since it is larger than the sum of its proper divisors (186097107).

20284572673 is a wasteful number, since it uses less digits than its factorization.

20284572673 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 186097106.

The product of its (nonzero) digits is 1128960, while the sum is 46.

The spelling of 20284572673 in words is "twenty billion, two hundred eighty-four million, five hundred seventy-two thousand, six hundred seventy-three".