400352020 has 12 divisors (see below), whose sum is σ = 840739284. Its totient is φ = 160140800.

The previous prime is 400352009. The next prime is 400352087. The reversal of 400352020 is 20253004.

It can be written as a sum of positive squares in 2 ways, for example, as 169676676 + 230675344 = 13026^2 + 15188^2 .

It is a junction number, because it is equal to n+sod(n) for n = 400351985 and 400352003.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10008781 + ... + 10008820.

It is an arithmetic number, because the mean of its divisors is an integer number (70061607).

Almost surely, 2^400352020 is an apocalyptic number.

It is an amenable number.

400352020 is an abundant number, since it is smaller than the sum of its proper divisors (440387264).

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

400352020 is a wasteful number, since it uses less digits than its factorization.

400352020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20017610 (or 20017608 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 16.

The square root of 400352020 is about 20008.7985646315. The cubic root of 400352020 is about 737.0223784818.

The spelling of 400352020 in words is "four hundred million, three hundred fifty-two thousand, twenty".