20278444 has 12 divisors (see below), whose sum is σ = 35603568. Its totient is φ = 10106000.

The previous prime is 20278441. The next prime is 20278459. The reversal of 20278444 is 44487202.

It is a super-2 number, since 2×20278444² = 822430582122272, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20278441) 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 3 ways as a sum of consecutive naturals, for example, 6907 + ... + 9394.

It is an arithmetic number, because the mean of its divisors is an integer number (2966964).

Almost surely, 2^20278444 is an apocalyptic number.

It is an amenable number.

20278444 is a deficient number, since it is larger than the sum of its proper divisors (15325124).

20278444 is a wasteful number, since it uses less digits than its factorization.

20278444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16616 (or 16614 counting only the distinct ones).

The product of its (nonzero) digits is 14336, while the sum is 31.

The square root of 20278444 is about 4503.1593354000. The cubic root of 20278444 is about 272.6956494108.

The spelling of 20278444 in words is "twenty million, two hundred seventy-eight thousand, four hundred forty-four".