20501329 has 2 divisors, whose sum is σ = 20501330. Its totient is φ = 20501328.

The previous prime is 20501309. The next prime is 20501333. The reversal of 20501329 is 92310502.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18105025 + 2396304 = 4255^2 + 1548^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20501329 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (20501309) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10250664 + 10250665.

It is an arithmetic number, because the mean of its divisors is an integer number (10250665).

Almost surely, 2^20501329 is an apocalyptic number.

It is an amenable number.

20501329 is a deficient number, since it is larger than the sum of its proper divisors (1).

20501329 is an equidigital number, since it uses as much as digits as its factorization.

20501329 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 540, while the sum is 22.

The square root of 20501329 is about 4527.8393301883. The cubic root of 20501329 is about 273.6910978822.

The spelling of 20501329 in words is "twenty million, five hundred one thousand, three hundred twenty-nine".