20660473 has 2 divisors, whose sum is σ = 20660474. Its totient is φ = 20660472.

The previous prime is 20660399. The next prime is 20660483. The reversal of 20660473 is 37406602.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14837904 + 5822569 = 3852^2 + 2413^2 .

It is a cyclic number.

It is not a de Polignac number, because 20660473 - 2¹⁷ = 20529401 is a prime.

It is not a weakly prime, because it can be changed into another prime (20660483) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10330236 + 10330237.

It is an arithmetic number, because the mean of its divisors is an integer number (10330237).

Almost surely, 2^20660473 is an apocalyptic number.

It is an amenable number.

20660473 is a deficient number, since it is larger than the sum of its proper divisors (1).

20660473 is an equidigital number, since it uses as much as digits as its factorization.

20660473 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6048, while the sum is 28.

The square root of 20660473 is about 4545.3793021045. The cubic root of 20660473 is about 274.3974598288.

The spelling of 20660473 in words is "twenty million, six hundred sixty thousand, four hundred seventy-three".