20278275 has 24 divisors (see below), whose sum is σ = 33871344. Its totient is φ = 10704000.

The previous prime is 20278267. The next prime is 20278351. The reversal of 20278275 is 57287202.

It is not a de Polignac number, because 20278275 - 2³ = 20278267 is a prime.

It is a super-2 number, since 2×20278275² = 822416873951250, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6237 + ... + 8913.

It is an arithmetic number, because the mean of its divisors is an integer number (1411306).

Almost surely, 2^20278275 is an apocalyptic number.

20278275 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

20278275 is a deficient number, since it is larger than the sum of its proper divisors (13593069).

20278275 is a wasteful number, since it uses less digits than its factorization.

20278275 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2791 (or 2786 counting only the distinct ones).

The product of its (nonzero) digits is 15680, while the sum is 33.

The square root of 20278275 is about 4503.1405707573. The cubic root of 20278275 is about 272.6948918626.

The spelling of 20278275 in words is "twenty million, two hundred seventy-eight thousand, two hundred seventy-five".