20278323 has 16 divisors (see below), whose sum is σ = 32353440. Its totient is φ = 12478752.

The previous prime is 20278267. The next prime is 20278351. The reversal of 20278323 is 32387202.

It is not a de Polignac number, because 20278323 - 2⁶ = 20278259 is a prime.

It is a super-2 number, since 2×20278323² = 822420767384658, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (20278393) 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 15 ways as a sum of consecutive naturals, for example, 28536 + ... + 29237.

It is an arithmetic number, because the mean of its divisors is an integer number (2022090).

Almost surely, 2^20278323 is an apocalyptic number.

20278323 is a deficient number, since it is larger than the sum of its proper divisors (12075117).

20278323 is a wasteful number, since it uses less digits than its factorization.

20278323 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57795 (or 57789 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 27.

The square root of 20278323 is about 4503.1459003679. The cubic root of 20278323 is about 272.6951070247.

The spelling of 20278323 in words is "twenty million, two hundred seventy-eight thousand, three hundred twenty-three".