20577229 has 2 divisors, whose sum is σ = 20577230. Its totient is φ = 20577228.

The previous prime is 20577131. The next prime is 20577257. The reversal of 20577229 is 92277502.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10824100 + 9753129 = 3290^2 + 3123^2 .

It is a cyclic number.

It is not a de Polignac number, because 20577229 - 2¹³ = 20569037 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20577194 and 20577203.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20577299) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10288614 + 10288615.

It is an arithmetic number, because the mean of its divisors is an integer number (10288615).

Almost surely, 2^20577229 is an apocalyptic number.

It is an amenable number.

20577229 is a deficient number, since it is larger than the sum of its proper divisors (1).

20577229 is an equidigital number, since it uses as much as digits as its factorization.

20577229 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 17640, while the sum is 34.

The square root of 20577229 is about 4536.2130681880. The cubic root of 20577229 is about 274.0284348987.

The spelling of 20577229 in words is "twenty million, five hundred seventy-seven thousand, two hundred twenty-nine".