20490392328 has 192 divisors, whose sum is σ = 60926670720. Its totient is φ = 5723827200.

The previous prime is 20490392327. The next prime is 20490392333. The reversal of 20490392328 is 82329309402.

It is a super-2 number, since 2×20490392328² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a self number, because there is not a number n which added to its sum of digits gives 20490392328.

It is not an unprimeable number, because it can be changed into a prime (20490392327) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 32472573 + ... + 32473203.

It is an arithmetic number, because the mean of its divisors is an integer number (317326410).

Almost surely, 2^20490392328 is an apocalyptic number.

20490392328 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 20490392328, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30463335360).

20490392328 is an abundant number, since it is smaller than the sum of its proper divisors (40436278392).

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

20490392328 is a wasteful number, since it uses less digits than its factorization.

20490392328 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1228 (or 1217 counting only the distinct ones).

The product of its (nonzero) digits is 186624, while the sum is 42.

The spelling of 20490392328 in words is "twenty billion, four hundred ninety million, three hundred ninety-two thousand, three hundred twenty-eight".