420243620 has 12 divisors (see below), whose sum is σ = 882511644. Its totient is φ = 168097440.

The previous prime is 420243617. The next prime is 420243667. The reversal of 420243620 is 26342024.

It can be written as a sum of positive squares in 2 ways, for example, as 64770304 + 355473316 = 8048^2 + 18854^2 .

It is a hoax number, since the sum of its digits (23) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10506071 + ... + 10506110.

It is an arithmetic number, because the mean of its divisors is an integer number (73542637).

Almost surely, 2^420243620 is an apocalyptic number.

It is an amenable number.

420243620 is an abundant number, since it is smaller than the sum of its proper divisors (462268024).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

420243620 is a wasteful number, since it uses less digits than its factorization.

420243620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21012190 (or 21012188 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 23.

The square root of 420243620 is about 20499.8443896533. The cubic root of 420243620 is about 749.0320074878.

Adding to 420243620 its reverse (26342024), we get a palindrome (446585644).

The spelling of 420243620 in words is "four hundred twenty million, two hundred forty-three thousand, six hundred twenty".