20204280 has 48 divisors (see below), whose sum is σ = 65665080. Its totient is φ = 5387712.

The previous prime is 20204273. The next prime is 20204293. The reversal of 20204280 is 8240202.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 27702 + ... + 28421.

Almost surely, 2^20204280 is an apocalyptic number.

20204280 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20204280 is an abundant number, since it is smaller than the sum of its proper divisors (45460800).

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

20204280 is a wasteful number, since it uses less digits than its factorization.

20204280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56140 (or 56133 counting only the distinct ones).

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

The square root of 20204280 is about 4494.9171293807. The cubic root of 20204280 is about 272.3628016248.

Adding to 20204280 its reverse (8240202), we get a palindrome (28444482).

The spelling of 20204280 in words is "twenty million, two hundred four thousand, two hundred eighty".