20427278 has 4 divisors (see below), whose sum is σ = 30640920. Its totient is φ = 10213638.

The previous prime is 20427271. The next prime is 20427283. The reversal of 20427278 is 87272402.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20427271) 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 as a sum of consecutive naturals, namely, 5106818 + ... + 5106821.

It is an arithmetic number, because the mean of its divisors is an integer number (7660230).

Almost surely, 2^20427278 is an apocalyptic number.

20427278 is a deficient number, since it is larger than the sum of its proper divisors (10213642).

20427278 is a wasteful number, since it uses less digits than its factorization.

20427278 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10213641.

The product of its (nonzero) digits is 12544, while the sum is 32.

The square root of 20427278 is about 4519.6546328232. The cubic root of 20427278 is about 273.3611753647.

The spelling of 20427278 in words is "twenty million, four hundred twenty-seven thousand, two hundred seventy-eight".