820111111028 has 12 divisors (see below), whose sum is σ = 1565666666592. Its totient is φ = 372777777720.

The previous prime is 820111110971. The next prime is 820111111051.

820111111028 is nontrivially palindromic in base 10.

It is a junction number, because it is equal to n+sod(n) for n = 820111110988 and 820111111006.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9319444400 + ... + 9319444487.

It is an arithmetic number, because the mean of its divisors is an integer number (130472222216).

Almost surely, 2^820111111028 is an apocalyptic number.

It is an amenable number.

820111111028 is a deficient number, since it is larger than the sum of its proper divisors (745555555564).

820111111028 is a wasteful number, since it uses less digits than its factorization.

820111111028 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18638888902 (or 18638888900 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 26.

It can be divided in two parts, 820111 and 111028, that added together give a palindrome (931139).

The spelling of 820111111028 in words is "eight hundred twenty billion, one hundred eleven million, one hundred eleven thousand, twenty-eight".