20661282 has 24 divisors (see below), whose sum is σ = 46310940. Its totient is φ = 6649440.

The previous prime is 20661257. The next prime is 20661287. The reversal of 20661282 is 28216602.

It can be written as a sum of positive squares in 2 ways, for example, as 20439441 + 221841 = 4521^2 + 471^2 .

It is not an unprimeable number, because it can be changed into a prime (20661287) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 19269 + ... + 20312.

Almost surely, 2^20661282 is an apocalyptic number.

20661282 is an abundant number, since it is smaller than the sum of its proper divisors (25649658).

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

20661282 is a wasteful number, since it uses less digits than its factorization.

20661282 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39618 (or 39615 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 27.

The square root of 20661282 is about 4545.4682927065. The cubic root of 20661282 is about 274.4010412997.

Adding to 20661282 its reverse (28216602), we get a palindrome (48877884).

The spelling of 20661282 in words is "twenty million, six hundred sixty-one thousand, two hundred eighty-two".