420220477 has 2 divisors, whose sum is σ = 420220478. Its totient is φ = 420220476.

The previous prime is 420220441. The next prime is 420220481. The reversal of 420220477 is 774022024.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 362293156 + 57927321 = 19034^2 + 7611^2 .

It is a cyclic number.

It is not a de Polignac number, because 420220477 - 2⁷ = 420220349 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (420230477) 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, 210110238 + 210110239.

It is an arithmetic number, because the mean of its divisors is an integer number (210110239).

Almost surely, 2^420220477 is an apocalyptic number.

It is an amenable number.

420220477 is a deficient number, since it is larger than the sum of its proper divisors (1).

420220477 is an equidigital number, since it uses as much as digits as its factorization.

420220477 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6272, while the sum is 28.

The square root of 420220477 is about 20499.2799141824. The cubic root of 420220477 is about 749.0182573953.

The spelling of 420220477 in words is "four hundred twenty million, two hundred twenty thousand, four hundred seventy-seven".