20643111302 has 16 divisors (see below), whose sum is σ = 33799650192. Its totient is φ = 9377673120.

The previous prime is 20643111283. The next prime is 20643111311. The reversal of 20643111302 is 20311134602.

20643111302 is digitally balanced in base 5, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×20643111302² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 239873 + ... + 314364.

It is an arithmetic number, because the mean of its divisors is an integer number (2112478137).

Almost surely, 2^20643111302 is an apocalyptic number.

20643111302 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

20643111302 is a deficient number, since it is larger than the sum of its proper divisors (13156538890).

20643111302 is a wasteful number, since it uses less digits than its factorization.

20643111302 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 555943.

The product of its (nonzero) digits is 864, while the sum is 23.

Adding to 20643111302 its reverse (20311134602), we get a palindrome (40954245904).

The spelling of 20643111302 in words is "twenty billion, six hundred forty-three million, one hundred eleven thousand, three hundred two".