20969339 has 2 divisors, whose sum is σ = 20969340. Its totient is φ = 20969338.

The previous prime is 20969329. The next prime is 20969341. The reversal of 20969339 is 93396902.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20969339 is a prime.

Together with 20969341, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 20969296 and 20969305.

It is not a weakly prime, because it can be changed into another prime (20969309) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10484669 + 10484670.

It is an arithmetic number, because the mean of its divisors is an integer number (10484670).

Almost surely, 2^20969339 is an apocalyptic number.

20969339 is a deficient number, since it is larger than the sum of its proper divisors (1).

20969339 is an equidigital number, since it uses as much as digits as its factorization.

20969339 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 78732, while the sum is 41.

The square root of 20969339 is about 4579.2290835904. The cubic root of 20969339 is about 275.7580802147.

The spelling of 20969339 in words is "twenty million, nine hundred sixty-nine thousand, three hundred thirty-nine".