20464728 has 32 divisors (see below), whose sum is σ = 51509760. Its totient is φ = 6775200.

The previous prime is 20464723. The next prime is 20464751. The reversal of 20464728 is 82746402.

It is a super-2 number, since 2×20464728² = 837610184227968, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20464723) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 801 + ... + 6447.

It is an arithmetic number, because the mean of its divisors is an integer number (1609680).

Almost surely, 2^20464728 is an apocalyptic number.

It is an amenable number.

20464728 is an abundant number, since it is smaller than the sum of its proper divisors (31045032).

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

20464728 is a wasteful number, since it uses less digits than its factorization.

20464728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5807 (or 5803 counting only the distinct ones).

The product of its (nonzero) digits is 21504, while the sum is 33.

The square root of 20464728 is about 4523.7957513575. The cubic root of 20464728 is about 273.5281273885.

The spelling of 20464728 in words is "twenty million, four hundred sixty-four thousand, seven hundred twenty-eight".