20495843 has 2 divisors, whose sum is σ = 20495844. Its totient is φ = 20495842.

The previous prime is 20495831. The next prime is 20495861. The reversal of 20495843 is 34859402.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20495843 - 2¹⁶ = 20430307 is a prime.

It is not a weakly prime, because it can be changed into another prime (20495803) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10247921 + 10247922.

It is an arithmetic number, because the mean of its divisors is an integer number (10247922).

Almost surely, 2^20495843 is an apocalyptic number.

20495843 is a deficient number, since it is larger than the sum of its proper divisors (1).

20495843 is an equidigital number, since it uses as much as digits as its factorization.

20495843 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 34560, while the sum is 35.

The square root of 20495843 is about 4527.2334819402. The cubic root of 20495843 is about 273.6666831510. Note that the first 4 decimals are identical.

The spelling of 20495843 in words is "twenty million, four hundred ninety-five thousand, eight hundred forty-three".