20830817728 has 56 divisors (see below), whose sum is σ = 47288626784. Its totient is φ = 8918553600.

The previous prime is 20830817677. The next prime is 20830817779. The reversal of 20830817728 is 82771803802.

It is an interprime number because it is at equal distance from previous prime (20830817677) and next prime (20830817779).

It is a tau number, because it is divible by the number of its divisors (56).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 434638 + ... + 480178.

It is an arithmetic number, because the mean of its divisors is an integer number (844439764).

Almost surely, 2^20830817728 is an apocalyptic number.

20830817728 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

20830817728 is an abundant number, since it is smaller than the sum of its proper divisors (26457809056).

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

20830817728 is a wasteful number, since it uses less digits than its factorization.

20830817728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46581 (or 46571 counting only the distinct ones).

The product of its (nonzero) digits is 301056, while the sum is 46.

The spelling of 20830817728 in words is "twenty billion, eight hundred thirty million, eight hundred seventeen thousand, seven hundred twenty-eight".