20912329 has 9 divisors (see below), whose sum is σ = 22297717. Its totient is φ = 19609024.

The previous prime is 20912317. The next prime is 20912341. The reversal of 20912329 is 92321902.

The square root of 20912329 is 4573.

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

It is an interprime number because it is at equal distance from previous prime (20912317) and next prime (20912341).

It can be written as a sum of positive squares in 4 ways, for example, as 1092025 + 19820304 = 1045^2 + 4452^2 .

It is a de Polignac number, because none of the positive numbers 2^k-20912329 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20912297 and 20912306.

It is not an unprimeable number, because it can be changed into a prime (20912029) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 77607 + ... + 77875.

Almost surely, 2^20912329 is an apocalyptic number.

20912329 is the 4573-rd square number.

20912329 is the 2287-th centered octagonal number.

It is an amenable number.

20912329 is a deficient number, since it is larger than the sum of its proper divisors (1385388).

20912329 is an frugal number, since it uses more digits than its factorization.

20912329 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 572 (or 286 counting only the distinct ones).

The product of its (nonzero) digits is 1944, while the sum is 28.

The cubic root of 20912329 is about 275.5079493492.

The spelling of 20912329 in words is "twenty million, nine hundred twelve thousand, three hundred twenty-nine".