20212747 has 2 divisors, whose sum is σ = 20212748. Its totient is φ = 20212746.

The previous prime is 20212729. The next prime is 20212771. The reversal of 20212747 is 74721202.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20212747 is a prime.

It is not a weakly prime, because it can be changed into another prime (20212547) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10106373 + 10106374.

It is an arithmetic number, because the mean of its divisors is an integer number (10106374).

Almost surely, 2^20212747 is an apocalyptic number.

20212747 is a deficient number, since it is larger than the sum of its proper divisors (1).

20212747 is an equidigital number, since it uses as much as digits as its factorization.

20212747 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1568, while the sum is 25.

The square root of 20212747 is about 4495.8588723402. The cubic root of 20212747 is about 272.4008426369.

Adding to 20212747 its reverse (74721202), we get a palindrome (94933949).

The spelling of 20212747 in words is "twenty million, two hundred twelve thousand, seven hundred forty-seven".