20684905354 has 8 divisors (see below), whose sum is σ = 31050159588. Its totient is φ = 10334852160.

The previous prime is 20684905333. The next prime is 20684905361. The reversal of 20684905354 is 45350948602.

It can be written as a sum of positive squares in 2 ways, for example, as 20102986225 + 581919129 = 141785^2 + 24123^2 .

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 (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3796857 + ... + 3802300.

Almost surely, 2^20684905354 is an apocalyptic number.

20684905354 is a deficient number, since it is larger than the sum of its proper divisors (10365254234).

20684905354 is a wasteful number, since it uses less digits than its factorization.

20684905354 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7600520.

The product of its (nonzero) digits is 1036800, while the sum is 46.

The spelling of 20684905354 in words is "twenty billion, six hundred eighty-four million, nine hundred five thousand, three hundred fifty-four".