20309529828 has 192 divisors, whose sum is σ = 57888940032. Its totient is φ = 5416519680.

The previous prime is 20309529827. The next prime is 20309529829. The reversal of 20309529828 is 82892590302.

It is an interprime number because it is at equal distance from previous prime (20309529827) and next prime (20309529829).

It is not an unprimeable number, because it can be changed into a prime (20309529827) 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 63 ways as a sum of consecutive naturals, for example, 24677025 + ... + 24677847.

It is an arithmetic number, because the mean of its divisors is an integer number (301504896).

Almost surely, 2^20309529828 is an apocalyptic number.

20309529828 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20309529828, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28944470016).

20309529828 is an abundant number, since it is smaller than the sum of its proper divisors (37579410204).

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

20309529828 is a wasteful number, since it uses less digits than its factorization.

20309529828 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1154 (or 1152 counting only the distinct ones).

The product of its (nonzero) digits is 622080, while the sum is 48.

The spelling of 20309529828 in words is "twenty billion, three hundred nine million, five hundred twenty-nine thousand, eight hundred twenty-eight".