20490803 has 2 divisors, whose sum is σ = 20490804. Its totient is φ = 20490802.

The previous prime is 20490787. The next prime is 20490823. The reversal of 20490803 is 30809402.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20490803 - 2⁴ = 20490787 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (20490823) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10245401 + 10245402.

It is an arithmetic number, because the mean of its divisors is an integer number (10245402).

Almost surely, 2^20490803 is an apocalyptic number.

20490803 is a deficient number, since it is larger than the sum of its proper divisors (1).

20490803 is an equidigital number, since it uses as much as digits as its factorization.

20490803 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1728, while the sum is 26.

The square root of 20490803 is about 4526.6768163853. The cubic root of 20490803 is about 273.6442494449.

The spelling of 20490803 in words is "twenty million, four hundred ninety thousand, eight hundred three".