20281043 has 2 divisors, whose sum is σ = 20281044. Its totient is φ = 20281042.

The previous prime is 20281039. The next prime is 20281049. The reversal of 20281043 is 34018202.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20281043 - 2² = 20281039 is a prime.

It is a super-2 number, since 2×20281043² = 822641410335698, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (20281049) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10140521 + 10140522.

It is an arithmetic number, because the mean of its divisors is an integer number (10140522).

Almost surely, 2^20281043 is an apocalyptic number.

20281043 is a deficient number, since it is larger than the sum of its proper divisors (1).

20281043 is an equidigital number, since it uses as much as digits as its factorization.

20281043 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 384, while the sum is 20.

The square root of 20281043 is about 4503.4479013307. The cubic root of 20281043 is about 272.7072989850.

Adding to 20281043 its reverse (34018202), we get a palindrome (54299245).

The spelling of 20281043 in words is "twenty million, two hundred eighty-one thousand, forty-three".