280204020 has 72 divisors (see below), whose sum is σ = 894697440. Its totient is φ = 70787520.

The previous prime is 280204007. The next prime is 280204021. The reversal of 280204020 is 20402082.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 280203984 and 280204002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (280204021) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 37546 + ... + 44385.

Almost surely, 2^280204020 is an apocalyptic number.

280204020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

280204020 is an abundant number, since it is smaller than the sum of its proper divisors (614493420).

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

280204020 is a wasteful number, since it uses less digits than its factorization.

280204020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81965 (or 81960 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 18.

The square root of 280204020 is about 16739.2956841081. The cubic root of 280204020 is about 654.3721194007.

The spelling of 280204020 in words is "two hundred eighty million, two hundred four thousand, twenty".