20743747 has 2 divisors, whose sum is σ = 20743748. Its totient is φ = 20743746.

The previous prime is 20743739. The next prime is 20743771. The reversal of 20743747 is 74734702.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20743747 - 2³ = 20743739 is a prime.

It is not a weakly prime, because it can be changed into another prime (20743847) 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, 10371873 + 10371874.

It is an arithmetic number, because the mean of its divisors is an integer number (10371874).

Almost surely, 2^20743747 is an apocalyptic number.

20743747 is a deficient number, since it is larger than the sum of its proper divisors (1).

20743747 is an equidigital number, since it uses as much as digits as its factorization.

20743747 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 32928, while the sum is 34.

The square root of 20743747 is about 4554.5303819384. The cubic root of 20743747 is about 274.7656273065.

The spelling of 20743747 in words is "twenty million, seven hundred forty-three thousand, seven hundred forty-seven".