20397673 has 2 divisors, whose sum is σ = 20397674. Its totient is φ = 20397672.

The previous prime is 20397647. The next prime is 20397677. The reversal of 20397673 is 37679302.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15745024 + 4652649 = 3968^2 + 2157^2 .

It is a cyclic number.

It is not a de Polignac number, because 20397673 - 2²¹ = 18300521 is a prime.

It is not a weakly prime, because it can be changed into another prime (20397677) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10198836 + 10198837.

It is an arithmetic number, because the mean of its divisors is an integer number (10198837).

Almost surely, 2^20397673 is an apocalyptic number.

It is an amenable number.

20397673 is a deficient number, since it is larger than the sum of its proper divisors (1).

20397673 is an equidigital number, since it uses as much as digits as its factorization.

20397673 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 47628, while the sum is 37.

The square root of 20397673 is about 4516.3783056781. The cubic root of 20397673 is about 273.2290518650.

The spelling of 20397673 in words is "twenty million, three hundred ninety-seven thousand, six hundred seventy-three".