20278000 has 40 divisors (see below), whose sum is σ = 49037040. Its totient is φ = 8110400.

The previous prime is 20277953. The next prime is 20278001. The reversal of 20278000 is 87202.

It is a tau number, because it is divible by the number of its divisors (40).

It is a super-2 number, since 2×20278000² = 822394568000000, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20278001) 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 7 ways as a sum of consecutive naturals, for example, 3070 + ... + 7069.

It is an arithmetic number, because the mean of its divisors is an integer number (1225926).

Almost surely, 2^20278000 is an apocalyptic number.

20278000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20278000 is an abundant number, since it is smaller than the sum of its proper divisors (28759040).

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

20278000 is a wasteful number, since it uses less digits than its factorization.

20278000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10162 (or 10146 counting only the distinct ones).

The product of its (nonzero) digits is 224, while the sum is 19.

The square root of 20278000 is about 4503.1100364082. The cubic root of 20278000 is about 272.6936591570.

The spelling of 20278000 in words is "twenty million, two hundred seventy-eight thousand".