20618272 has 24 divisors (see below), whose sum is σ = 41361516. Its totient is φ = 10113792.

The previous prime is 20618261. The next prime is 20618293. The reversal of 20618272 is 27281602.

It can be written as a sum of positive squares in 2 ways, for example, as 20034576 + 583696 = 4476^2 + 764^2 .

It is a super-2 number, since 2×20618272² = 850226280531968, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 20618272.

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, 4383 + ... + 7774.

Almost surely, 2^20618272 is an apocalyptic number.

It is an amenable number.

20618272 is an abundant number, since it is smaller than the sum of its proper divisors (20743244).

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

20618272 is a wasteful number, since it uses less digits than its factorization.

20618272 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12220 (or 12212 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 28.

The square root of 20618272 is about 4540.7347423077. The cubic root of 20618272 is about 274.2105047596.

Adding to 20618272 its reverse (27281602), we get a palindrome (47899874).

The spelling of 20618272 in words is "twenty million, six hundred eighteen thousand, two hundred seventy-two".