20278825 has 12 divisors (see below), whose sum is σ = 28738240. Its totient is φ = 13905360.

The previous prime is 20278799. The next prime is 20278837. The reversal of 20278825 is 52887202.

It is not a de Polignac number, because 20278825 - 2⁵ = 20278793 is a prime.

It is a super-2 number, since 2×20278825² = 822461486761250, which contains 22 as substring.

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 11 ways as a sum of consecutive naturals, for example, 57765 + ... + 58114.

Almost surely, 2^20278825 is an apocalyptic number.

20278825 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20278825 is a deficient number, since it is larger than the sum of its proper divisors (8459415).

20278825 is a wasteful number, since it uses less digits than its factorization.

20278825 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 115896 (or 115891 counting only the distinct ones).

The product of its (nonzero) digits is 17920, while the sum is 34.

The square root of 20278825 is about 4503.2016388343. The cubic root of 20278825 is about 272.6973572406.

The spelling of 20278825 in words is "twenty million, two hundred seventy-eight thousand, eight hundred twenty-five".