20721343354 has 8 divisors (see below), whose sum is σ = 31083942420. Its totient is φ = 10360029216.

The previous prime is 20721343319. The next prime is 20721343369. The reversal of 20721343354 is 45334312702.

It can be written as a sum of positive squares in 2 ways, for example, as 20012346225 + 708997129 = 141465^2 + 26627^2 .

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 (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 279849 + ... + 346060.

Almost surely, 2^20721343354 is an apocalyptic number.

20721343354 is a deficient number, since it is larger than the sum of its proper divisors (10362599066).

20721343354 is a wasteful number, since it uses less digits than its factorization.

20721343354 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 642464.

The product of its (nonzero) digits is 60480, while the sum is 34.

The spelling of 20721343354 in words is "twenty billion, seven hundred twenty-one million, three hundred forty-three thousand, three hundred fifty-four".