20278200 has 48 divisors (see below), whose sum is σ = 62864280. Its totient is φ = 5407360.

The previous prime is 20278177. The next prime is 20278201. The reversal of 20278200 is 287202.

It is a super-2 number, since 2×20278200² = 822410790480000, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20278201) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 16299 + ... + 17498.

Almost surely, 2^20278200 is an apocalyptic number.

20278200 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20278200 is an abundant number, since it is smaller than the sum of its proper divisors (42586080).

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

20278200 is a wasteful number, since it uses less digits than its factorization.

20278200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33816 (or 33807 counting only the distinct ones).

The product of its (nonzero) digits is 448, while the sum is 21.

The square root of 20278200 is about 4503.1322432280. The cubic root of 20278200 is about 272.6945556713.

The spelling of 20278200 in words is "twenty million, two hundred seventy-eight thousand, two hundred".