20278426 has 16 divisors (see below), whose sum is σ = 35090496. Its totient is φ = 8608896.

The previous prime is 20278411. The next prime is 20278441. The reversal of 20278426 is 62487202.

It is an interprime number because it is at equal distance from previous prime (20278411) and next prime (20278441).

It is a super-2 number, since 2×20278426² = 822429122074952, 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 7 ways as a sum of consecutive naturals, for example, 5271 + ... + 8266.

It is an arithmetic number, because the mean of its divisors is an integer number (2193156).

Almost surely, 2^20278426 is an apocalyptic number.

20278426 is a deficient number, since it is larger than the sum of its proper divisors (14812070).

20278426 is a wasteful number, since it uses less digits than its factorization.

20278426 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13653.

The product of its (nonzero) digits is 10752, while the sum is 31.

The square root of 20278426 is about 4503.1573368027. The cubic root of 20278426 is about 272.6955687254.

The spelling of 20278426 in words is "twenty million, two hundred seventy-eight thousand, four hundred twenty-six".