20557673 has 2 divisors, whose sum is σ = 20557674. Its totient is φ = 20557672.

The previous prime is 20557651. The next prime is 20557697. The reversal of 20557673 is 37675502.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12475024 + 8082649 = 3532^2 + 2843^2 .

It is a cyclic number.

It is not a de Polignac number, because 20557673 - 2²⁰ = 19509097 is a prime.

It is not a weakly prime, because it can be changed into another prime (20557633) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10278836 + 10278837.

It is an arithmetic number, because the mean of its divisors is an integer number (10278837).

Almost surely, 2^20557673 is an apocalyptic number.

It is an amenable number.

20557673 is a deficient number, since it is larger than the sum of its proper divisors (1).

20557673 is an equidigital number, since it uses as much as digits as its factorization.

20557673 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 44100, while the sum is 35.

The square root of 20557673 is about 4534.0570133160. The cubic root of 20557673 is about 273.9415978320.

The spelling of 20557673 in words is "twenty million, five hundred fifty-seven thousand, six hundred seventy-three".