420220824 has 32 divisors (see below), whose sum is σ = 1112350320. Its totient is φ = 131833856.

The previous prime is 420220793. The next prime is 420220831. The reversal of 420220824 is 428022024.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a junction number, because it is equal to n+sod(n) for n = 420220794 and 420220803.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 514569 + ... + 515384.

Almost surely, 2^420220824 is an apocalyptic number.

It is an amenable number.

420220824 is an abundant number, since it is smaller than the sum of its proper divisors (692129496).

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

420220824 is a wasteful number, since it uses less digits than its factorization.

420220824 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1029979 (or 1029975 counting only the distinct ones).

The product of its (nonzero) digits is 2048, while the sum is 24.

The square root of 420220824 is about 20499.2883778925. The cubic root of 420220824 is about 749.0184635642.

Adding to 420220824 its reverse (428022024), we get a palindrome (848242848).

The spelling of 420220824 in words is "four hundred twenty million, two hundred twenty thousand, eight hundred twenty-four".