20280272 has 10 divisors (see below), whose sum is σ = 39293058. Its totient is φ = 10140128.

The previous prime is 20280259. The next prime is 20280287. The reversal of 20280272 is 27208202.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 19678096 + 602176 = 4436^2 + 776^2 .

It is a super-2 number, since 2×20280272² = 822578864787968, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 633743 + ... + 633774.

Almost surely, 2^20280272 is an apocalyptic number.

It is an amenable number.

20280272 is a deficient number, since it is larger than the sum of its proper divisors (19012786).

20280272 is a wasteful number, since it uses less digits than its factorization.

20280272 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1267525 (or 1267519 counting only the distinct ones).

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

The square root of 20280272 is about 4503.3622994381. The cubic root of 20280272 is about 272.7038432129.

Adding to 20280272 its reverse (27208202), we get a palindrome (47488474).

The spelling of 20280272 in words is "twenty million, two hundred eighty thousand, two hundred seventy-two".