20861833 has 2 divisors, whose sum is σ = 20861834. Its totient is φ = 20861832.

The previous prime is 20861809. The next prime is 20861891. The reversal of 20861833 is 33816802.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20675209 + 186624 = 4547^2 + 432^2 .

It is a cyclic number.

It is not a de Polignac number, because 20861833 - 2¹³ = 20853641 is a prime.

It is a super-2 number, since 2×20861833² = 870432152239778, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20861795 and 20861804.

It is not a weakly prime, because it can be changed into another prime (20861803) 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, 10430916 + 10430917.

It is an arithmetic number, because the mean of its divisors is an integer number (10430917).

Almost surely, 2^20861833 is an apocalyptic number.

It is an amenable number.

20861833 is a deficient number, since it is larger than the sum of its proper divisors (1).

20861833 is an equidigital number, since it uses as much as digits as its factorization.

20861833 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6912, while the sum is 31.

The square root of 20861833 is about 4567.4755609636. The cubic root of 20861833 is about 275.2860186715.

The spelling of 20861833 in words is "twenty million, eight hundred sixty-one thousand, eight hundred thirty-three".