20873747 has 2 divisors, whose sum is σ = 20873748. Its totient is φ = 20873746.

The previous prime is 20873737. The next prime is 20873759. The reversal of 20873747 is 74737802.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20873747 - 2⁶ = 20873683 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20873747.

It is not a weakly prime, because it can be changed into another prime (20873737) 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, 10436873 + 10436874.

It is an arithmetic number, because the mean of its divisors is an integer number (10436874).

Almost surely, 2^20873747 is an apocalyptic number.

20873747 is a deficient number, since it is larger than the sum of its proper divisors (1).

20873747 is an equidigital number, since it uses as much as digits as its factorization.

20873747 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 65856, while the sum is 38.

The square root of 20873747 is about 4568.7795963474. The cubic root of 20873747 is about 275.3384131323.

The spelling of 20873747 in words is "twenty million, eight hundred seventy-three thousand, seven hundred forty-seven".