20545207 has 2 divisors, whose sum is σ = 20545208. Its totient is φ = 20545206.

The previous prime is 20545201. The next prime is 20545237. The reversal of 20545207 is 70254502.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20545207 - 2¹⁵ = 20512439 is a prime.

It is equal to p_1302937 and since 20545207 and 1302937 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20545201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10272603 + 10272604.

It is an arithmetic number, because the mean of its divisors is an integer number (10272604).

Almost surely, 2^20545207 is an apocalyptic number.

20545207 is a deficient number, since it is larger than the sum of its proper divisors (1).

20545207 is an equidigital number, since it uses as much as digits as its factorization.

20545207 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2800, while the sum is 25.

The square root of 20545207 is about 4532.6820978313. The cubic root of 20545207 is about 273.8862146756.

Adding to 20545207 its reverse (70254502), we get a palindrome (90799709).

The spelling of 20545207 in words is "twenty million, five hundred forty-five thousand, two hundred seven".