20643080329 has 3 divisors (see below), whose sum is σ = 20643224007. Its totient is φ = 20642936652.

The previous prime is 20643080323. The next prime is 20643080357. The reversal of 20643080329 is 92308034602.

The square root of 20643080329 is 143677.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 20622396025 + 20684304 = 143605^2 + 4548^2 .

It is not a de Polignac number, because 20643080329 - 2¹⁹ = 20642556041 is a prime.

It is a super-2 number, since 2×20643080329² (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 (20643080323) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 71839 + ... + 215515.

It is an arithmetic number, because the mean of its divisors is an integer number (6881074669).

Almost surely, 2^20643080329 is an apocalyptic number.

20643080329 is the 143677-th square number.

20643080329 is the 71839-th centered octagonal number.

It is an amenable number.

20643080329 is a deficient number, since it is larger than the sum of its proper divisors (143678).

20643080329 is an frugal number, since it uses more digits than its factorization.

20643080329 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 287354 (or 143677 counting only the distinct ones).

The product of its (nonzero) digits is 62208, while the sum is 37.

The spelling of 20643080329 in words is "twenty billion, six hundred forty-three million, eighty thousand, three hundred twenty-nine".