420020291 has 4 divisors (see below), whose sum is σ = 420101232. Its totient is φ = 419939352.

The previous prime is 420020243. The next prime is 420020297. The reversal of 420020291 is 192020024.

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 420020291 - 2¹⁴ = 420003907 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (420020297) 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, 32111 + ... + 43256.

It is an arithmetic number, because the mean of its divisors is an integer number (105025308).

Almost surely, 2^420020291 is an apocalyptic number.

420020291 is a deficient number, since it is larger than the sum of its proper divisors (80941).

420020291 is an equidigital number, since it uses as much as digits as its factorization.

420020291 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80940.

The product of its (nonzero) digits is 288, while the sum is 20.

The square root of 420020291 is about 20494.3965756496. The cubic root of 420020291 is about 748.8992985840.

The spelling of 420020291 in words is "four hundred twenty million, twenty thousand, two hundred ninety-one".