20727778 has 8 divisors (see below), whose sum is σ = 32094720. Its totient is φ = 10029540.

The previous prime is 20727757. The next prime is 20727827. The reversal of 20727778 is 87772702.

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

It is a self number, because there is not a number n which added to its sum of digits gives 20727778.

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, 167098 + ... + 167221.

It is an arithmetic number, because the mean of its divisors is an integer number (4011840).

Almost surely, 2^20727778 is an apocalyptic number.

20727778 is a deficient number, since it is larger than the sum of its proper divisors (11366942).

20727778 is a wasteful number, since it uses less digits than its factorization.

20727778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 334352.

The product of its (nonzero) digits is 76832, while the sum is 40.

The square root of 20727778 is about 4552.7769547827. The cubic root of 20727778 is about 274.6951022995.

The spelling of 20727778 in words is "twenty million, seven hundred twenty-seven thousand, seven hundred seventy-eight".