20147078 has 8 divisors (see below), whose sum is σ = 34537872. Its totient is φ = 8634456.

The previous prime is 20147063. The next prime is 20147089. The reversal of 20147078 is 87074102.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-3 number, since 3×20147078³ (a number of 23 digits) contains 333 as substring.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 20147078.

It is a congruent number.

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 3 ways as a sum of consecutive naturals, for example, 719525 + ... + 719552.

It is an arithmetic number, because the mean of its divisors is an integer number (4317234).

Almost surely, 2^20147078 is an apocalyptic number.

20147078 is a deficient number, since it is larger than the sum of its proper divisors (14390794).

20147078 is a wasteful number, since it uses less digits than its factorization.

20147078 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1439086.

The product of its (nonzero) digits is 3136, while the sum is 29.

The square root of 20147078 is about 4488.5496543984. The cubic root of 20147078 is about 272.1055224223.

The spelling of 20147078 in words is "twenty million, one hundred forty-seven thousand, seventy-eight".