20278328 has 32 divisors (see below), whose sum is σ = 43653600. Its totient is φ = 8650752.

The previous prime is 20278267. The next prime is 20278351. The reversal of 20278328 is 82387202.

It is a super-2 number, since 2×20278328² = 822421172951168, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20278294 and 20278303.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13688 + ... + 15096.

It is an arithmetic number, because the mean of its divisors is an integer number (1364175).

Almost surely, 2^20278328 is an apocalyptic number.

20278328 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

20278328 is an abundant number, since it is smaller than the sum of its proper divisors (23375272).

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

20278328 is a wasteful number, since it uses less digits than its factorization.

20278328 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1679 (or 1675 counting only the distinct ones).

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

The square root of 20278328 is about 4503.1464555353. The cubic root of 20278328 is about 272.6951294374.

The spelling of 20278328 in words is "twenty million, two hundred seventy-eight thousand, three hundred twenty-eight".