20675747 has 2 divisors, whose sum is σ = 20675748. Its totient is φ = 20675746.

The previous prime is 20675737. The next prime is 20675761. The reversal of 20675747 is 74757602.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20675747 - 2¹⁴ = 20659363 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20675747.

It is not a weakly prime, because it can be changed into another prime (20675737) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10337873 + 10337874.

It is an arithmetic number, because the mean of its divisors is an integer number (10337874).

Almost surely, 2^20675747 is an apocalyptic number.

20675747 is a deficient number, since it is larger than the sum of its proper divisors (1).

20675747 is an equidigital number, since it uses as much as digits as its factorization.

20675747 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 82320, while the sum is 38.

The square root of 20675747 is about 4547.0591595008. The cubic root of 20675747 is about 274.4650625794.

The spelling of 20675747 in words is "twenty million, six hundred seventy-five thousand, seven hundred forty-seven".