20925828 has 72 divisors (see below), whose sum is σ = 65956800. Its totient is φ = 5434560.

The previous prime is 20925823. The next prime is 20925829. The reversal of 20925828 is 82852902.

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 = 20925792 and 20925801.

It is not an unprimeable number, because it can be changed into a prime (20925823) 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 23 ways as a sum of consecutive naturals, for example, 1003 + ... + 6546.

Almost surely, 2^20925828 is an apocalyptic number.

20925828 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 20925828, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32978400).

20925828 is an abundant number, since it is smaller than the sum of its proper divisors (45030972).

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

20925828 is a wasteful number, since it uses less digits than its factorization.

20925828 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7577 (or 7572 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 36.

The square root of 20925828 is about 4574.4757076631. The cubic root of 20925828 is about 275.5672171280.

The spelling of 20925828 in words is "twenty million, nine hundred twenty-five thousand, eight hundred twenty-eight".