20403073 has 2 divisors, whose sum is σ = 20403074. Its totient is φ = 20403072.

The previous prime is 20403023. The next prime is 20403083. The reversal of 20403073 is 37030402.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19775809 + 627264 = 4447^2 + 792^2 .

It is a cyclic number.

It is not a de Polignac number, because 20403073 - 2²¹ = 18305921 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20403073.

It is not a weakly prime, because it can be changed into another prime (20403013) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10201536 + 10201537.

It is an arithmetic number, because the mean of its divisors is an integer number (10201537).

Almost surely, 2^20403073 is an apocalyptic number.

It is an amenable number.

20403073 is a deficient number, since it is larger than the sum of its proper divisors (1).

20403073 is an equidigital number, since it uses as much as digits as its factorization.

20403073 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 504, while the sum is 19.

The square root of 20403073 is about 4516.9760902622. The cubic root of 20403073 is about 273.2531609337.

Adding to 20403073 its reverse (37030402), we get a palindrome (57433475).

The spelling of 20403073 in words is "twenty million, four hundred three thousand, seventy-three".