20424828 has 48 divisors (see below), whose sum is σ = 50916096. Its totient is φ = 6357120.

The previous prime is 20424827. The next prime is 20424841. The reversal of 20424828 is 82842402.

It is a Smith number, since the sum of its digits (30) coincides with the sum of the digits of its prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 20424795 and 20424804.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20424827) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11008 + ... + 12728.

It is an arithmetic number, because the mean of its divisors is an integer number (1060752).

Almost surely, 2^20424828 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 20424828, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25458048).

20424828 is an abundant number, since it is smaller than the sum of its proper divisors (30491268).

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

20424828 is a wasteful number, since it uses less digits than its factorization.

20424828 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1794 (or 1792 counting only the distinct ones).

The product of its (nonzero) digits is 8192, while the sum is 30.

The square root of 20424828 is about 4519.3835862870. The cubic root of 20424828 is about 273.3502461608.

The spelling of 20424828 in words is "twenty million, four hundred twenty-four thousand, eight hundred twenty-eight".