20516421362 has 8 divisors (see below), whose sum is σ = 30820091436. Its totient is φ = 10243057552.

The previous prime is 20516421323. The next prime is 20516421379. The reversal of 20516421362 is 26312461502.

It can be written as a sum of positive squares in 2 ways, for example, as 12798623161 + 7717798201 = 113131^2 + 87851^2 .

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7574873 + ... + 7577580.

Almost surely, 2^20516421362 is an apocalyptic number.

20516421362 is a deficient number, since it is larger than the sum of its proper divisors (10303670074).

20516421362 is a wasteful number, since it uses less digits than its factorization.

20516421362 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15153132.

The product of its (nonzero) digits is 17280, while the sum is 32.

Adding to 20516421362 its reverse (26312461502), we get a palindrome (46828882864).

The spelling of 20516421362 in words is "twenty billion, five hundred sixteen million, four hundred twenty-one thousand, three hundred sixty-two".