420220243 has 4 divisors (see below), whose sum is σ = 427342680. Its totient is φ = 413097808.

The previous prime is 420220231. The next prime is 420220247. The reversal of 420220243 is 342022024.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 420220243 - 2⁹ = 420219731 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 420220243.

It is not an unprimeable number, because it can be changed into a prime (420220247) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3561130 + ... + 3561247.

It is an arithmetic number, because the mean of its divisors is an integer number (106835670).

Almost surely, 2^420220243 is an apocalyptic number.

420220243 is a deficient number, since it is larger than the sum of its proper divisors (7122437).

420220243 is an equidigital number, since it uses as much as digits as its factorization.

420220243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7122436.

The product of its (nonzero) digits is 768, while the sum is 19.

The square root of 420220243 is about 20499.2742066640. The cubic root of 420220243 is about 749.0181183648.

Adding to 420220243 its reverse (342022024), we get a palindrome (762242267).

The spelling of 420220243 in words is "four hundred twenty million, two hundred twenty thousand, two hundred forty-three".