403280020 has 144 divisors (see below), whose sum is σ = 1032490368. Its totient is φ = 130429440.

The previous prime is 403280011. The next prime is 403280029. The reversal of 403280020 is 20082304.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (403280011) and next prime (403280029).

It is a self number, because there is not a number n which added to its sum of digits gives 403280020.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (403280029) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 3915289 + ... + 3915391.

It is an arithmetic number, because the mean of its divisors is an integer number (7170072).

Almost surely, 2^403280020 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 403280020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (516245184).

403280020 is an abundant number, since it is smaller than the sum of its proper divisors (629210348).

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

403280020 is a wasteful number, since it uses less digits than its factorization.

403280020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 210 (or 171 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 19.

The square root of 403280020 is about 20081.8330836605. The cubic root of 403280020 is about 738.8147693400.

The spelling of 403280020 in words is "four hundred three million, two hundred eighty thousand, twenty".