20474928 has 60 divisors (see below), whose sum is σ = 59289360. Its totient is φ = 6588288.

The previous prime is 20474921. The next prime is 20474929. The reversal of 20474928 is 82947402.

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 = 20474892 and 20474901.

It is not an unprimeable number, because it can be changed into a prime (20474921) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1725 + ... + 6627.

It is an arithmetic number, because the mean of its divisors is an integer number (988156).

Almost surely, 2^20474928 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 20474928, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29644680).

20474928 is an abundant number, since it is smaller than the sum of its proper divisors (38814432).

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

20474928 is a wasteful number, since it uses less digits than its factorization.

20474928 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4946 (or 4937 counting only the distinct ones).

The product of its (nonzero) digits is 32256, while the sum is 36.

The square root of 20474928 is about 4524.9229827700. The cubic root of 20474928 is about 273.5735636712.

The spelling of 20474928 in words is "twenty million, four hundred seventy-four thousand, nine hundred twenty-eight".