8420815403420 has 144 divisors (see below), whose sum is σ = 20725393489920. Its totient is φ = 2865459494016.

The previous prime is 8420815403419. The next prime is 8420815403491. The reversal of 8420815403420 is 243045180248.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 540376949 + ... + 540392531.

It is an arithmetic number, because the mean of its divisors is an integer number (143926343680).

Almost surely, 2^{8420815403420} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 8420815403420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (10362696744960).

8420815403420 is an abundant number, since it is smaller than the sum of its proper divisors (12304578086500).

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

8420815403420 is a wasteful number, since it uses less digits than its factorization.

8420815403420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19712 (or 19703 counting only the distinct ones).

The product of its (nonzero) digits is 245760, while the sum is 41.

The spelling of 8420815403420 in words is "eight trillion, four hundred twenty billion, eight hundred fifteen million, four hundred three thousand, four hundred twenty".