20456641903 has 2 divisors, whose sum is σ = 20456641904. Its totient is φ = 20456641902.

The previous prime is 20456641889. The next prime is 20456641949. The reversal of 20456641903 is 30914665402.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20456641903 - 2⁹ = 20456641391 is a prime.

It is a super-2 number, since 2×20456641903² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20456641993) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10228320951 + 10228320952.

It is an arithmetic number, because the mean of its divisors is an integer number (10228320952).

Almost surely, 2^20456641903 is an apocalyptic number.

20456641903 is a deficient number, since it is larger than the sum of its proper divisors (1).

20456641903 is an equidigital number, since it uses as much as digits as its factorization.

20456641903 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 155520, while the sum is 40.

The spelling of 20456641903 in words is "twenty billion, four hundred fifty-six million, six hundred forty-one thousand, nine hundred three".