20128470 has 32 divisors (see below), whose sum is σ = 48813408. Its totient is φ = 5311488.

The previous prime is 20128469. The next prime is 20128477. The reversal of 20128470 is 7482102.

It is a self number, because there is not a number n which added to its sum of digits gives 20128470.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20128477) 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, 549 + ... + 6368.

It is an arithmetic number, because the mean of its divisors is an integer number (1525419).

Almost surely, 2^20128470 is an apocalyptic number.

20128470 is an abundant number, since it is smaller than the sum of its proper divisors (28684938).

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

20128470 is a wasteful number, since it uses less digits than its factorization.

20128470 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7024.

The product of its (nonzero) digits is 896, while the sum is 24.

The square root of 20128470 is about 4486.4763456414. The cubic root of 20128470 is about 272.0217236831.

The spelling of 20128470 in words is "twenty million, one hundred twenty-eight thousand, four hundred seventy".