280421020 has 36 divisors (see below), whose sum is σ = 642988584. Its totient is φ = 101880960.

The previous prime is 280420979. The next prime is 280421023. The reversal of 280421020 is 20124082.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (280421023) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 247816 + ... + 248944.

It is an arithmetic number, because the mean of its divisors is an integer number (17860794).

Almost surely, 2^280421020 is an apocalyptic number.

280421020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

280421020 is an abundant number, since it is smaller than the sum of its proper divisors (362567564).

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

280421020 is a wasteful number, since it uses less digits than its factorization.

280421020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2278 (or 1147 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 19.

The square root of 280421020 is about 16745.7761838620. The cubic root of 280421020 is about 654.5409988590.

The spelling of 280421020 in words is "two hundred eighty million, four hundred twenty-one thousand, twenty".