20023785828 has 72 divisors (see below), whose sum is σ = 51439706136. Its totient is φ = 6566400000.

The previous prime is 20023785827. The next prime is 20023785829. The reversal of 20023785828 is 82858732002.

20023785828 is a `hidden beast` number, since 200 + 2 + 378 + 58 + 28 = 666.

It is an interprime number because it is at equal distance from previous prime (20023785827) and next prime (20023785829).

It can be written as a sum of positive squares in 4 ways, for example, as 5978691684 + 14045094144 = 77322^2 + 118512^2 .

It is a super-2 number, since 2×20023785828² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20023785823) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1044328 + ... + 1063328.

It is an arithmetic number, because the mean of its divisors is an integer number (714440363).

Almost surely, 2^20023785828 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20023785828, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25719853068).

20023785828 is an abundant number, since it is smaller than the sum of its proper divisors (31415920308).

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

20023785828 is a wasteful number, since it uses less digits than its factorization.

20023785828 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19485 (or 19480 counting only the distinct ones).

The product of its (nonzero) digits is 430080, while the sum is 45.

The spelling of 20023785828 in words is "twenty billion, twenty-three million, seven hundred eighty-five thousand, eight hundred twenty-eight".