20451073 has 2 divisors, whose sum is σ = 20451074. Its totient is φ = 20451072.

The previous prime is 20451059. The next prime is 20451077. The reversal of 20451073 is 37015402.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14961424 + 5489649 = 3868^2 + 2343^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20451073 is a prime.

It is not a weakly prime, because it can be changed into another prime (20451077) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10225536 + 10225537.

It is an arithmetic number, because the mean of its divisors is an integer number (10225537).

Almost surely, 2^20451073 is an apocalyptic number.

It is an amenable number.

20451073 is a deficient number, since it is larger than the sum of its proper divisors (1).

20451073 is an equidigital number, since it uses as much as digits as its factorization.

20451073 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 840, while the sum is 22.

The square root of 20451073 is about 4522.2862580779. The cubic root of 20451073 is about 273.4672770380.

Adding to 20451073 its reverse (37015402), we get a palindrome (57466475).

The spelling of 20451073 in words is "twenty million, four hundred fifty-one thousand, seventy-three".