20018807 has 2 divisors, whose sum is σ = 20018808. Its totient is φ = 20018806.

The previous prime is 20018773. The next prime is 20018819. The reversal of 20018807 is 70881002.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20018807 - 2⁶ = 20018743 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20048807) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10009403 + 10009404.

It is an arithmetic number, because the mean of its divisors is an integer number (10009404).

Almost surely, 2^20018807 is an apocalyptic number.

20018807 is a deficient number, since it is larger than the sum of its proper divisors (1).

20018807 is an equidigital number, since it uses as much as digits as its factorization.

20018807 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 896, while the sum is 26.

The square root of 20018807 is about 4474.2381474392. The cubic root of 20018807 is about 271.5268184242.

Adding to 20018807 its reverse (70881002), we get a palindrome (90899809).

The spelling of 20018807 in words is "twenty million, eighteen thousand, eight hundred seven".