20828660844 has 24 divisors (see below), whose sum is σ = 48623268400. Its totient is φ = 6939592704.

The previous prime is 20828660837. The next prime is 20828660849. The reversal of 20828660844 is 44806682802.

It is a super-2 number, since 2×20828660844² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20828660793 and 20828660802.

It is not an unprimeable number, because it can be changed into a prime (20828660849) by changing a digit.

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, 385369 + ... + 436080.

Almost surely, 2^20828660844 is an apocalyptic number.

It is an amenable number.

20828660844 is an abundant number, since it is smaller than the sum of its proper divisors (27794607556).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20828660844 is a wasteful number, since it uses less digits than its factorization.

20828660844 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 823569 (or 823567 counting only the distinct ones).

The product of its (nonzero) digits is 1179648, while the sum is 48.

The spelling of 20828660844 in words is "twenty billion, eight hundred twenty-eight million, six hundred sixty thousand, eight hundred forty-four".