20843101 has 2 divisors, whose sum is σ = 20843102. Its totient is φ = 20843100.

The previous prime is 20843093. The next prime is 20843117. The reversal of 20843101 is 10134802.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18267076 + 2576025 = 4274^2 + 1605^2 .

It is a cyclic number.

It is not a de Polignac number, because 20843101 - 2³ = 20843093 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20843161) by changing a digit.

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, 10421550 + 10421551.

It is an arithmetic number, because the mean of its divisors is an integer number (10421551).

Almost surely, 2^20843101 is an apocalyptic number.

It is an amenable number.

20843101 is a deficient number, since it is larger than the sum of its proper divisors (1).

20843101 is an equidigital number, since it uses as much as digits as its factorization.

20843101 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 192, while the sum is 19.

The square root of 20843101 is about 4565.4245147631. The cubic root of 20843101 is about 275.2036001887.

Adding to 20843101 its reverse (10134802), we get a palindrome (30977903).

The spelling of 20843101 in words is "twenty million, eight hundred forty-three thousand, one hundred one".