20424277 has 2 divisors, whose sum is σ = 20424278. Its totient is φ = 20424276.

The previous prime is 20424263. The next prime is 20424301. The reversal of 20424277 is 77242402.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20421361 + 2916 = 4519^2 + 54^2 .

It is a cyclic number.

It is not a de Polignac number, because 20424277 - 2¹⁹ = 19899989 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20424247) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10212138 + 10212139.

It is an arithmetic number, because the mean of its divisors is an integer number (10212139).

Almost surely, 2^20424277 is an apocalyptic number.

It is an amenable number.

20424277 is a deficient number, since it is larger than the sum of its proper divisors (1).

20424277 is an equidigital number, since it uses as much as digits as its factorization.

20424277 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6272, while the sum is 28.

The square root of 20424277 is about 4519.3226262350. The cubic root of 20424277 is about 273.3477880848.

Adding to 20424277 its reverse (77242402), we get a palindrome (97666679).

The spelling of 20424277 in words is "twenty million, four hundred twenty-four thousand, two hundred seventy-seven".