20400803 has 2 divisors, whose sum is σ = 20400804. Its totient is φ = 20400802.

The previous prime is 20400719. The next prime is 20400811. The reversal of 20400803 is 30800402.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20400803 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (20400823) 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, 10200401 + 10200402.

It is an arithmetic number, because the mean of its divisors is an integer number (10200402).

Almost surely, 2^20400803 is an apocalyptic number.

20400803 is a deficient number, since it is larger than the sum of its proper divisors (1).

20400803 is an equidigital number, since it uses as much as digits as its factorization.

20400803 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 17.

The square root of 20400803 is about 4516.7248089739. The cubic root of 20400803 is about 273.2430267139.

The spelling of 20400803 in words is "twenty million, four hundred thousand, eight hundred three".