20243677 has 2 divisors, whose sum is σ = 20243678. Its totient is φ = 20243676.

The previous prime is 20243659. The next prime is 20243681. The reversal of 20243677 is 77634202.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18071001 + 2172676 = 4251^2 + 1474^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20243677 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20243687) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10121838 + 10121839.

It is an arithmetic number, because the mean of its divisors is an integer number (10121839).

Almost surely, 2^20243677 is an apocalyptic number.

It is an amenable number.

20243677 is a deficient number, since it is larger than the sum of its proper divisors (1).

20243677 is an equidigital number, since it uses as much as digits as its factorization.

20243677 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 14112, while the sum is 31.

The square root of 20243677 is about 4499.2973895932. The cubic root of 20243677 is about 272.5397164567.

Adding to 20243677 its reverse (77634202), we get a palindrome (97877879).

The spelling of 20243677 in words is "twenty million, two hundred forty-three thousand, six hundred seventy-seven".