20472128 has 42 divisors (see below), whose sum is σ = 41831514. Its totient is φ = 9940224.

The previous prime is 20472113. The next prime is 20472143. The reversal of 20472128 is 82127402.

It is an interprime number because it is at equal distance from previous prime (20472113) and next prime (20472143).

It can be written as a sum of positive squares in only one way, i.e., 19998784 + 473344 = 4472^2 + 688^2 .

It is a junction number, because it is equal to n+sod(n) for n = 20472097 and 20472106.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 118250 + ... + 118422.

Almost surely, 2^20472128 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 20472128, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20915757).

20472128 is an abundant number, since it is smaller than the sum of its proper divisors (21359386).

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

20472128 is an equidigital number, since it uses as much as digits as its factorization.

20472128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 271 (or 218 counting only the distinct ones).

The product of its (nonzero) digits is 1792, while the sum is 26.

The square root of 20472128 is about 4524.6135746603. The cubic root of 20472128 is about 273.5610924690.

The spelling of 20472128 in words is "twenty million, four hundred seventy-two thousand, one hundred twenty-eight".