20438304562 has 8 divisors (see below), whose sum is σ = 33015722796. Its totient is φ = 9433063632.

The previous prime is 20438304457. The next prime is 20438304569. The reversal of 20438304562 is 26540383402.

It can be written as a sum of positive squares in 2 ways, for example, as 17628138441 + 2810166121 = 132771^2 + 53011^2 .

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

It is not an unprimeable number, because it can be changed into a prime (20438304569) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 393044293 + ... + 393044344.

Almost surely, 2^20438304562 is an apocalyptic number.

20438304562 is a deficient number, since it is larger than the sum of its proper divisors (12577418234).

20438304562 is a wasteful number, since it uses less digits than its factorization.

20438304562 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 786088652.

The product of its (nonzero) digits is 138240, while the sum is 37.

Adding to 20438304562 its reverse (26540383402), we get a palindrome (46978687964).

The spelling of 20438304562 in words is "twenty billion, four hundred thirty-eight million, three hundred four thousand, five hundred sixty-two".