20645646303 has 4 divisors (see below), whose sum is σ = 27527528408. Its totient is φ = 13763764200.

The previous prime is 20645646293. The next prime is 20645646313. The reversal of 20645646303 is 30364654602.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (20645646293) and next prime (20645646313).

It is not a de Polignac number, because 20645646303 - 2⁹ = 20645645791 is a prime.

It is a super-2 number, since 2×20645646303² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20645646313) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3440941048 + ... + 3440941053.

It is an arithmetic number, because the mean of its divisors is an integer number (6881882102).

Almost surely, 2^20645646303 is an apocalyptic number.

20645646303 is a deficient number, since it is larger than the sum of its proper divisors (6881882105).

20645646303 is an equidigital number, since it uses as much as digits as its factorization.

20645646303 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6881882104.

The product of its (nonzero) digits is 311040, while the sum is 39.

The spelling of 20645646303 in words is "twenty billion, six hundred forty-five million, six hundred forty-six thousand, three hundred three".