20571403 has 2 divisors, whose sum is σ = 20571404. Its totient is φ = 20571402.

The previous prime is 20571401. The next prime is 20571409. The reversal of 20571403 is 30417502.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20571403 - 2¹ = 20571401 is a prime.

Together with 20571401, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (20571401) 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, 10285701 + 10285702.

It is an arithmetic number, because the mean of its divisors is an integer number (10285702).

Almost surely, 2^20571403 is an apocalyptic number.

20571403 is a deficient number, since it is larger than the sum of its proper divisors (1).

20571403 is an equidigital number, since it uses as much as digits as its factorization.

20571403 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 840, while the sum is 22.

The square root of 20571403 is about 4535.5708571248. The cubic root of 20571403 is about 274.0025707042.

Adding to 20571403 its reverse (30417502), we get a palindrome (50988905).

The spelling of 20571403 in words is "twenty million, five hundred seventy-one thousand, four hundred three".