20700073 has 2 divisors, whose sum is σ = 20700074. Its totient is φ = 20700072.

The previous prime is 20700059. The next prime is 20700077. The reversal of 20700073 is 37000702.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15303744 + 5396329 = 3912^2 + 2323^2 .

It is a cyclic number.

It is not a de Polignac number, because 20700073 - 2⁵ = 20700041 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20700073.

It is not a weakly prime, because it can be changed into another prime (20700077) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10350036 + 10350037.

It is an arithmetic number, because the mean of its divisors is an integer number (10350037).

Almost surely, 2^20700073 is an apocalyptic number.

It is an amenable number.

20700073 is a deficient number, since it is larger than the sum of its proper divisors (1).

20700073 is an equidigital number, since it uses as much as digits as its factorization.

20700073 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 294, while the sum is 19.

The square root of 20700073 is about 4549.7332888863. The cubic root of 20700073 is about 274.5726607935.

Adding to 20700073 its reverse (37000702), we get a palindrome (57700775).

The spelling of 20700073 in words is "twenty million, seven hundred thousand, seventy-three".