20428480 has 28 divisors (see below), whose sum is σ = 48646080. Its totient is φ = 8171264.

The previous prime is 20428469. The next prime is 20428487. The reversal of 20428480 is 8482402.

It is a super-2 number, since 2×20428480² = 834645590220800, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20428487) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 31600 + ... + 32239.

It is an arithmetic number, because the mean of its divisors is an integer number (1737360).

Almost surely, 2^20428480 is an apocalyptic number.

20428480 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20428480 is an abundant number, since it is smaller than the sum of its proper divisors (28217600).

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

20428480 is an equidigital number, since it uses as much as digits as its factorization.

20428480 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63856 (or 63846 counting only the distinct ones).

The product of its (nonzero) digits is 4096, while the sum is 28.

The square root of 20428480 is about 4519.7876056293. The cubic root of 20428480 is about 273.3665370464.

The spelling of 20428480 in words is "twenty million, four hundred twenty-eight thousand, four hundred eighty".