20744747 has 2 divisors, whose sum is σ = 20744748. Its totient is φ = 20744746.

The previous prime is 20744723. The next prime is 20744803. The reversal of 20744747 is 74744702.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20744747 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (20740747) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10372373 + 10372374.

It is an arithmetic number, because the mean of its divisors is an integer number (10372374).

Almost surely, 2^20744747 is an apocalyptic number.

20744747 is a deficient number, since it is larger than the sum of its proper divisors (1).

20744747 is an equidigital number, since it uses as much as digits as its factorization.

20744747 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 43904, while the sum is 35.

The square root of 20744747 is about 4554.6401614178. The cubic root of 20744747 is about 274.7700424717.

It can be divided in two parts, 207 and 44747, that multiplied together give a palindrome (9262629).

The spelling of 20744747 in words is "twenty million, seven hundred forty-four thousand, seven hundred forty-seven".