20403213049 has 2 divisors, whose sum is σ = 20403213050. Its totient is φ = 20403213048.

The previous prime is 20403213031. The next prime is 20403213073. The reversal of 20403213049 is 94031230402.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11687123449 + 8716089600 = 108107^2 + 93360^2 .

It is a cyclic number.

It is not a de Polignac number, because 20403213049 - 2¹⁷ = 20403081977 is a prime.

It is a super-2 number, since 2×20403213049² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (20403213029) 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, 10201606524 + 10201606525.

It is an arithmetic number, because the mean of its divisors is an integer number (10201606525).

Almost surely, 2^20403213049 is an apocalyptic number.

It is an amenable number.

20403213049 is a deficient number, since it is larger than the sum of its proper divisors (1).

20403213049 is an equidigital number, since it uses as much as digits as its factorization.

20403213049 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5184, while the sum is 28.

The spelling of 20403213049 in words is "twenty billion, four hundred three million, two hundred thirteen thousand, forty-nine".