20437273 has 2 divisors, whose sum is σ = 20437274. Its totient is φ = 20437272.

The previous prime is 20437237. The next prime is 20437289. The reversal of 20437273 is 37273402.

Together with previous prime (20437237) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10969344 + 9467929 = 3312^2 + 3077^2 .

It is a cyclic number.

It is not a de Polignac number, because 20437273 - 2¹³ = 20429081 is a prime.

It is not a weakly prime, because it can be changed into another prime (20437873) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10218636 + 10218637.

It is an arithmetic number, because the mean of its divisors is an integer number (10218637).

Almost surely, 2^20437273 is an apocalyptic number.

It is an amenable number.

20437273 is a deficient number, since it is larger than the sum of its proper divisors (1).

20437273 is an equidigital number, since it uses as much as digits as its factorization.

20437273 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 20437273 is about 4520.7602236792. The cubic root of 20437273 is about 273.4057530032.

It can be divided in two parts, 2043 and 7273, that added together give a triangular number (9316 = T₁₃₆).

The spelling of 20437273 in words is "twenty million, four hundred thirty-seven thousand, two hundred seventy-three".