20005207 has 2 divisors, whose sum is σ = 20005208. Its totient is φ = 20005206.

The previous prime is 20005177. The next prime is 20005213. The reversal of 20005207 is 70250002.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20005207 - 2¹⁹ = 19480919 is a prime.

It is a super-2 number, since 2×20005207² = 800416614225698, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20005507) 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, 10002603 + 10002604.

It is an arithmetic number, because the mean of its divisors is an integer number (10002604).

Almost surely, 2^20005207 is an apocalyptic number.

20005207 is a deficient number, since it is larger than the sum of its proper divisors (1).

20005207 is an equidigital number, since it uses as much as digits as its factorization.

20005207 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 140, while the sum is 16.

The square root of 20005207 is about 4472.7180774111. The cubic root of 20005207 is about 271.4653162363.

Adding to 20005207 its reverse (70250002), we get a palindrome (90255209).

The spelling of 20005207 in words is "twenty million, five thousand, two hundred seven".