20473709 has 2 divisors, whose sum is σ = 20473710. Its totient is φ = 20473708.

The previous prime is 20473669. The next prime is 20473721. The reversal of 20473709 is 90737402.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17197609 + 3276100 = 4147^2 + 1810^2 .

It is a cyclic number.

It is not a de Polignac number, because 20473709 - 2¹² = 20469613 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20473759) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10236854 + 10236855.

It is an arithmetic number, because the mean of its divisors is an integer number (10236855).

Almost surely, 2^20473709 is an apocalyptic number.

It is an amenable number.

20473709 is a deficient number, since it is larger than the sum of its proper divisors (1).

20473709 is an equidigital number, since it uses as much as digits as its factorization.

20473709 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10584, while the sum is 32.

The square root of 20473709 is about 4524.7882823398. The cubic root of 20473709 is about 273.5681343840.

The spelling of 20473709 in words is "twenty million, four hundred seventy-three thousand, seven hundred nine".