20281086 has 48 divisors (see below), whose sum is σ = 51184224. Its totient is φ = 5683392.

The previous prime is 20281081. The next prime is 20281087. The reversal of 20281086 is 68018202.

It is a super-2 number, since 2×20281086² = 822644898678792, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20281081) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5160 + ... + 8196.

It is an arithmetic number, because the mean of its divisors is an integer number (1066338).

Almost surely, 2^20281086 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20281086, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25592112).

20281086 is an abundant number, since it is smaller than the sum of its proper divisors (30903138).

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

20281086 is a wasteful number, since it uses less digits than its factorization.

20281086 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3105 (or 3102 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 27.

The square root of 20281086 is about 4503.4526754480. The cubic root of 20281086 is about 272.7074917168.

Adding to 20281086 its reverse (68018202), we get a palindrome (88299288).

The spelling of 20281086 in words is "twenty million, two hundred eighty-one thousand, eighty-six".