20242687 has 2 divisors, whose sum is σ = 20242688. Its totient is φ = 20242686.

The previous prime is 20242603. The next prime is 20242697. The reversal of 20242687 is 78624202.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20242687 - 2⁷ = 20242559 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20242697) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10121343 + 10121344.

It is an arithmetic number, because the mean of its divisors is an integer number (10121344).

Almost surely, 2^20242687 is an apocalyptic number.

20242687 is a deficient number, since it is larger than the sum of its proper divisors (1).

20242687 is an equidigital number, since it uses as much as digits as its factorization.

20242687 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10752, while the sum is 31.

The square root of 20242687 is about 4499.1873710705. The cubic root of 20242687 is about 272.5352736091.

Adding to 20242687 its reverse (78624202), we get a palindrome (98866889).

The spelling of 20242687 in words is "twenty million, two hundred forty-two thousand, six hundred eighty-seven".