405320001020 has 96 divisors (see below), whose sum is σ = 970761093120. Its totient is φ = 140979938880.

The previous prime is 405320000963. The next prime is 405320001049. The reversal of 405320001020 is 20100023504.

It is a self number, because there is not a number n which added to its sum of digits gives 405320001020.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2601029 + ... + 2752451.

It is an arithmetic number, because the mean of its divisors is an integer number (10112094720).

Almost surely, 2^405320001020 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 405320001020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (485380546560).

405320001020 is an abundant number, since it is smaller than the sum of its proper divisors (565441092100).

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

405320001020 is a wasteful number, since it uses less digits than its factorization.

405320001020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 151512 (or 151464 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 17.

Adding to 405320001020 its reverse (20100023504), we get a palindrome (425420024524).

The spelling of 405320001020 in words is "four hundred five billion, three hundred twenty million, one thousand, twenty".