20969329 has 2 divisors, whose sum is σ = 20969330. Its totient is φ = 20969328.

The previous prime is 20969321. The next prime is 20969339. The reversal of 20969329 is 92396902.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12588304 + 8381025 = 3548^2 + 2895^2 .

It is a cyclic number.

It is not a de Polignac number, because 20969329 - 2³ = 20969321 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20969291 and 20969300.

It is not a weakly prime, because it can be changed into another prime (20969321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10484664 + 10484665.

It is an arithmetic number, because the mean of its divisors is an integer number (10484665).

Almost surely, 2^20969329 is an apocalyptic number.

It is an amenable number.

20969329 is a deficient number, since it is larger than the sum of its proper divisors (1).

20969329 is an equidigital number, since it uses as much as digits as its factorization.

20969329 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 52488, while the sum is 40.

The square root of 20969329 is about 4579.2279917034. The cubic root of 20969329 is about 275.7580363796.

The spelling of 20969329 in words is "twenty million, nine hundred sixty-nine thousand, three hundred twenty-nine".