20723473 has 2 divisors, whose sum is σ = 20723474. Its totient is φ = 20723472.

The previous prime is 20723453. The next prime is 20723489. The reversal of 20723473 is 37432702.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17740944 + 2982529 = 4212^2 + 1727^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20723473 is a prime.

It is not a weakly prime, because it can be changed into another prime (20723413) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10361736 + 10361737.

It is an arithmetic number, because the mean of its divisors is an integer number (10361737).

Almost surely, 2^20723473 is an apocalyptic number.

It is an amenable number.

20723473 is a deficient number, since it is larger than the sum of its proper divisors (1).

20723473 is an equidigital number, since it uses as much as digits as its factorization.

20723473 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7056, while the sum is 28.

The square root of 20723473 is about 4552.3041418605. The cubic root of 20723473 is about 274.6760836297.

The spelling of 20723473 in words is "twenty million, seven hundred twenty-three thousand, four hundred seventy-three".