420020911 has 2 divisors, whose sum is σ = 420020912. Its totient is φ = 420020910.

The previous prime is 420020873. The next prime is 420020957. The reversal of 420020911 is 119020024.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 420020911 - 2⁹ = 420020399 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (420020971) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210010455 + 210010456.

It is an arithmetic number, because the mean of its divisors is an integer number (210010456).

Almost surely, 2^420020911 is an apocalyptic number.

420020911 is a deficient number, since it is larger than the sum of its proper divisors (1).

420020911 is an equidigital number, since it uses as much as digits as its factorization.

420020911 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 144, while the sum is 19.

The square root of 420020911 is about 20494.4117017298. The cubic root of 420020911 is about 748.8996670720.

Adding to 420020911 its reverse (119020024), we get a palindrome (539040935).

The spelling of 420020911 in words is "four hundred twenty million, twenty thousand, nine hundred eleven".