20287328 has 24 divisors (see below), whose sum is σ = 40236840. Its totient is φ = 10068480.

The previous prime is 20287313. The next prime is 20287343. The reversal of 20287328 is 82378202.

It is an interprime number because it is at equal distance from previous prime (20287313) and next prime (20287343).

It is a super-3 number, since 3×20287328³ (a number of 23 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (32).

It is a junction number, because it is equal to n+sod(n) for n = 20287294 and 20287303.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2168 + ... + 6728.

It is an arithmetic number, because the mean of its divisors is an integer number (1676535).

Almost surely, 2^20287328 is an apocalyptic number.

It is an amenable number.

20287328 is a deficient number, since it is larger than the sum of its proper divisors (19949512).

20287328 is a wasteful number, since it uses less digits than its factorization.

20287328 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4710 (or 4702 counting only the distinct ones).

The product of its (nonzero) digits is 10752, while the sum is 32.

The square root of 20287328 is about 4504.1456459577. The cubic root of 20287328 is about 272.7354663128.

The spelling of 20287328 in words is "twenty million, two hundred eighty-seven thousand, three hundred twenty-eight".