20206280 has 16 divisors (see below), whose sum is σ = 45464220. Its totient is φ = 8082496.

The previous prime is 20206279. The next prime is 20206283. The reversal of 20206280 is 8260202.

It can be written as a sum of positive squares in 2 ways, for example, as 16434916 + 3771364 = 4054^2 + 1942^2 .

It is a Harshad number since it is a multiple of its sum of digits (20).

It is not an unprimeable number, because it can be changed into a prime (20206283) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 252539 + ... + 252618.

Almost surely, 2^20206280 is an apocalyptic number.

20206280 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20206280 is an abundant number, since it is smaller than the sum of its proper divisors (25257940).

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

20206280 is a wasteful number, since it uses less digits than its factorization.

20206280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 505168 (or 505164 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 20.

The square root of 20206280 is about 4495.1395973874. The cubic root of 20206280 is about 272.3717882955.

Adding to 20206280 its reverse (8260202), we get a palindrome (28466482).

The spelling of 20206280 in words is "twenty million, two hundred six thousand, two hundred eighty".