20613206329 has 3 divisors (see below), whose sum is σ = 20613349903. Its totient is φ = 20613062756.

The previous prime is 20613206323. The next prime is 20613206347. The reversal of 20613206329 is 92360231602.

The square root of 20613206329 is 143573.

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., 19792269225 + 820937104 = 140685^2 + 28652^2 .

It is not a de Polignac number, because 20613206329 - 2³ = 20613206321 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20613206294 and 20613206303.

It is not an unprimeable number, because it can be changed into a prime (20613206321) 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, 71787 + ... + 215359.

Almost surely, 2^20613206329 is an apocalyptic number.

20613206329 is the 143573-rd square number.

20613206329 is the 71787-th centered octagonal number.

It is an amenable number.

20613206329 is a deficient number, since it is larger than the sum of its proper divisors (143574).

20613206329 is an frugal number, since it uses more digits than its factorization.

20613206329 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 287146 (or 143573 counting only the distinct ones).

The product of its (nonzero) digits is 23328, while the sum is 34.

The spelling of 20613206329 in words is "twenty billion, six hundred thirteen million, two hundred six thousand, three hundred twenty-nine".