20709433 has 2 divisors, whose sum is σ = 20709434. Its totient is φ = 20709432.

The previous prime is 20709431. The next prime is 20709461. The reversal of 20709433 is 33490702.

It is an a-pointer prime, because the next prime (20709461) can be obtained adding 20709433 to its sum of digits (28).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19998784 + 710649 = 4472^2 + 843^2 .

It is a cyclic number.

It is not a de Polignac number, because 20709433 - 2¹ = 20709431 is a prime.

Together with 20709431, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (20709431) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10354716 + 10354717.

It is an arithmetic number, because the mean of its divisors is an integer number (10354717).

Almost surely, 2^20709433 is an apocalyptic number.

It is an amenable number.

20709433 is a deficient number, since it is larger than the sum of its proper divisors (1).

20709433 is an equidigital number, since it uses as much as digits as its factorization.

20709433 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4536, while the sum is 28.

The square root of 20709433 is about 4550.7618043576. The cubic root of 20709433 is about 274.6140392763.

The spelling of 20709433 in words is "twenty million, seven hundred nine thousand, four hundred thirty-three".