20169828 has 36 divisors (see below), whose sum is σ = 58269120. Its totient is φ = 5762736.

The previous prime is 20169817. The next prime is 20169829. The reversal of 20169828 is 82896102.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 20169792 and 20169801.

It is not an unprimeable number, because it can be changed into a prime (20169829) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 39768 + ... + 40271.

Almost surely, 2^20169828 is an apocalyptic number.

20169828 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

20169828 is an abundant number, since it is smaller than the sum of its proper divisors (38099292).

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

20169828 is a wasteful number, since it uses less digits than its factorization.

20169828 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80056 (or 80051 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 36.

The square root of 20169828 is about 4491.0831655626. The cubic root of 20169828 is about 272.2079040520.

The spelling of 20169828 in words is "twenty million, one hundred sixty-nine thousand, eight hundred twenty-eight".