20470280 has 16 divisors (see below), whose sum is σ = 46058220. Its totient is φ = 8188096.

The previous prime is 20470249. The next prime is 20470291. The reversal of 20470280 is 8207402.

It can be written as a sum of positive squares in 2 ways, for example, as 18887716 + 1582564 = 4346^2 + 1258^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 255839 + ... + 255918.

Almost surely, 2^20470280 is an apocalyptic number.

20470280 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20470280 is an abundant number, since it is smaller than the sum of its proper divisors (25587940).

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

20470280 is a wasteful number, since it uses less digits than its factorization.

20470280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 511768 (or 511764 counting only the distinct ones).

The product of its (nonzero) digits is 896, while the sum is 23.

The square root of 20470280 is about 4524.4093537168. The cubic root of 20470280 is about 273.5528608527.

Adding to 20470280 its reverse (8207402), we get a palindrome (28677682).

The spelling of 20470280 in words is "twenty million, four hundred seventy thousand, two hundred eighty".