400452020 has 24 divisors (see below), whose sum is σ = 841793568. Its totient is φ = 160020000.

The previous prime is 400451993. The next prime is 400452061. The reversal of 400452020 is 20254004.

It is a self number, because there is not a number n which added to its sum of digits gives 400452020.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11495 + ... + 30545.

It is an arithmetic number, because the mean of its divisors is an integer number (35074732).

Almost surely, 2^400452020 is an apocalyptic number.

It is an amenable number.

400452020 is an abundant number, since it is smaller than the sum of its proper divisors (441341548).

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

400452020 is a wasteful number, since it uses less digits than its factorization.

400452020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20111 (or 20109 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 17.

The square root of 400452020 is about 20011.2973092701. The cubic root of 400452020 is about 737.0837379010.

The spelling of 400452020 in words is "four hundred million, four hundred fifty-two thousand, twenty".