401645020 has 96 divisors (see below), whose sum is σ = 995742720. Its totient is φ = 133224960.

The previous prime is 401645017. The next prime is 401645059. The reversal of 401645020 is 20546104.

It is a super-2 number, since 2×401645020² = 322637444181600800, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 401644982 and 401645000.

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, 958371 + ... + 958789.

It is an arithmetic number, because the mean of its divisors is an integer number (10372320).

Almost surely, 2^401645020 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 401645020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (497871360).

401645020 is an abundant number, since it is smaller than the sum of its proper divisors (594097700).

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

401645020 is a wasteful number, since it uses less digits than its factorization.

401645020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 643 (or 641 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 22.

The square root of 401645020 is about 20041.0833040532. The cubic root of 401645020 is about 737.8149691706.

The spelling of 401645020 in words is "four hundred one million, six hundred forty-five thousand, twenty".