401501320220 has 192 divisors, whose sum is σ = 1181286844416. Its totient is φ = 110494264320.

The previous prime is 401501320111. The next prime is 401501320261. The reversal of 401501320220 is 22023105104.

It is a super-2 number, since 2×401501320220² (a number of 24 digits) contains 22 as substring.

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 = 401501320192 and 401501320201.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 24482 + ... + 896438.

It is an arithmetic number, because the mean of its divisors is an integer number (6152535648).

Almost surely, 2^401501320220 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 401501320220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (590643422208).

401501320220 is an abundant number, since it is smaller than the sum of its proper divisors (779785524196).

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

401501320220 is a wasteful number, since it uses less digits than its factorization.

401501320220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 872020 (or 872018 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 20.

Adding to 401501320220 its reverse (22023105104), we get a palindrome (423524425324).

The spelling of 401501320220 in words is "four hundred one billion, five hundred one million, three hundred twenty thousand, two hundred twenty".