20743409 has 2 divisors, whose sum is σ = 20743410. Its totient is φ = 20743408.

The previous prime is 20743391. The next prime is 20743427. The reversal of 20743409 is 90434702.

It is a balanced prime because it is at equal distance from previous prime (20743391) and next prime (20743427).

It can be written as a sum of positive squares in only one way, i.e., 13667809 + 7075600 = 3697^2 + 2660^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20743409 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (20743469) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10371704 + 10371705.

It is an arithmetic number, because the mean of its divisors is an integer number (10371705).

Almost surely, 2^20743409 is an apocalyptic number.

It is an amenable number.

20743409 is a deficient number, since it is larger than the sum of its proper divisors (1).

20743409 is an equidigital number, since it uses as much as digits as its factorization.

20743409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6048, while the sum is 29.

The square root of 20743409 is about 4554.4932758760. The cubic root of 20743409 is about 274.7641349486.

The spelling of 20743409 in words is "twenty million, seven hundred forty-three thousand, four hundred nine".