20280224 has 12 divisors (see below), whose sum is σ = 39926754. Its totient is φ = 10140096.

The previous prime is 20280217. The next prime is 20280229. The reversal of 20280224 is 42208202.

It can be written as a sum of positive squares in only one way, i.e., 12816400 + 7463824 = 3580^2 + 2732^2 .

It is a super-2 number, since 2×20280224² = 822574970980352, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20280196 and 20280205.

It is not an unprimeable number, because it can be changed into a prime (20280229) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 316847 + ... + 316910.

Almost surely, 2^20280224 is an apocalyptic number.

It is an amenable number.

20280224 is a deficient number, since it is larger than the sum of its proper divisors (19646530).

20280224 is an equidigital number, since it uses as much as digits as its factorization.

20280224 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 633767 (or 633759 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 20.

The square root of 20280224 is about 4503.3569700835. The cubic root of 20280224 is about 272.7036280646.

Adding to 20280224 its reverse (42208202), we get a palindrome (62488426).

The spelling of 20280224 in words is "twenty million, two hundred eighty thousand, two hundred twenty-four".