28432020 has 24 divisors (see below), whose sum is σ = 79609824. Its totient is φ = 7581856.

The previous prime is 28432013. The next prime is 28432057. The reversal of 28432020 is 2023482.

It is a super-2 number, since 2×28432020² = 1616759522560800, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 236874 + ... + 236993.

It is an arithmetic number, because the mean of its divisors is an integer number (3317076).

Almost surely, 2^28432020 is an apocalyptic number.

28432020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28432020 is an abundant number, since it is smaller than the sum of its proper divisors (51177804).

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

28432020 is a wasteful number, since it uses less digits than its factorization.

28432020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 473879 (or 473877 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 21.

The square root of 28432020 is about 5332.1684144445. The cubic root of 28432020 is about 305.2126797545.

The spelling of 28432020 in words is "twenty-eight million, four hundred thirty-two thousand, twenty".