420020431220 has 48 divisors (see below), whose sum is σ = 964069897728. Its totient is φ = 152769767040.

The previous prime is 420020431163. The next prime is 420020431223. The reversal of 420020431220 is 22134020024.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 420020431192 and 420020431201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (420020431223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12038276 + ... + 12073115.

It is an arithmetic number, because the mean of its divisors is an integer number (20084789536).

Almost surely, 2^420020431220 is an apocalyptic number.

It is an amenable number.

420020431220 is an abundant number, since it is smaller than the sum of its proper divisors (544049466508).

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

420020431220 is a wasteful number, since it uses less digits than its factorization.

420020431220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24111480 (or 24111478 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 20.

Adding to 420020431220 its reverse (22134020024), we get a palindrome (442154451244).

The spelling of 420020431220 in words is "four hundred twenty billion, twenty million, four hundred thirty-one thousand, two hundred twenty".