20673157 has 2 divisors, whose sum is σ = 20673158. Its totient is φ = 20673156.

The previous prime is 20673151. The next prime is 20673181. The reversal of 20673157 is 75137602.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19589476 + 1083681 = 4426^2 + 1041^2 .

It is a cyclic number.

It is not a de Polignac number, because 20673157 - 2¹¹ = 20671109 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20673151) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10336578 + 10336579.

It is an arithmetic number, because the mean of its divisors is an integer number (10336579).

Almost surely, 2^20673157 is an apocalyptic number.

It is an amenable number.

20673157 is a deficient number, since it is larger than the sum of its proper divisors (1).

20673157 is an equidigital number, since it uses as much as digits as its factorization.

20673157 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8820, while the sum is 31.

The square root of 20673157 is about 4546.7743511197. The cubic root of 20673157 is about 274.4536015795.

The spelling of 20673157 in words is "twenty million, six hundred seventy-three thousand, one hundred fifty-seven".