420020424 has 32 divisors (see below), whose sum is σ = 1166724000. Its totient is φ = 140006736.

The previous prime is 420020423. The next prime is 420020443. The reversal of 420020424 is 424020024.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 420020397 and 420020406.

It is not an unprimeable number, because it can be changed into a prime (420020423) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 972054 + ... + 972485.

It is an arithmetic number, because the mean of its divisors is an integer number (36460125).

Almost surely, 2^420020424 is an apocalyptic number.

It is an amenable number.

420020424 is an abundant number, since it is smaller than the sum of its proper divisors (746703576).

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

420020424 is a wasteful number, since it uses less digits than its factorization.

420020424 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1944554 (or 1944544 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 18.

The square root of 420020424 is about 20494.3998204388. The cubic root of 420020424 is about 748.8993776306.

Adding to 420020424 its reverse (424020024), we get a palindrome (844040448).

The spelling of 420020424 in words is "four hundred twenty million, twenty thousand, four hundred twenty-four".