20300557 has 2 divisors, whose sum is σ = 20300558. Its totient is φ = 20300556.

The previous prime is 20300519. The next prime is 20300573. The reversal of 20300557 is 75500302.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18412681 + 1887876 = 4291^2 + 1374^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20300557 is a prime.

It is a super-2 number, since 2×20300557² = 824225229020498, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20300507) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10150278 + 10150279.

It is an arithmetic number, because the mean of its divisors is an integer number (10150279).

Almost surely, 2^20300557 is an apocalyptic number.

It is an amenable number.

20300557 is a deficient number, since it is larger than the sum of its proper divisors (1).

20300557 is an equidigital number, since it uses as much as digits as its factorization.

20300557 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1050, while the sum is 22.

The square root of 20300557 is about 4505.6139426276. The cubic root of 20300557 is about 272.7947353883.

Adding to 20300557 its reverse (75500302), we get a palindrome (95800859).

The spelling of 20300557 in words is "twenty million, three hundred thousand, five hundred fifty-seven".