20289707 has 2 divisors, whose sum is σ = 20289708. Its totient is φ = 20289706.

The previous prime is 20289683. The next prime is 20289713. The reversal of 20289707 is 70798202.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20289707 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (20289757) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10144853 + 10144854.

It is an arithmetic number, because the mean of its divisors is an integer number (10144854).

Almost surely, 2^20289707 is an apocalyptic number.

20289707 is a deficient number, since it is larger than the sum of its proper divisors (1).

20289707 is an equidigital number, since it uses as much as digits as its factorization.

20289707 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 14112, while the sum is 35.

The square root of 20289707 is about 4504.4097282552. The cubic root of 20289707 is about 272.7461266999.

The spelling of 20289707 in words is "twenty million, two hundred eighty-nine thousand, seven hundred seven".