20771378 has 4 divisors (see below), whose sum is σ = 31157070. Its totient is φ = 10385688.

The previous prime is 20771371. The next prime is 20771383. The reversal of 20771378 is 87317702.

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

It can be written as a sum of positive squares in only one way, i.e., 20313049 + 458329 = 4507^2 + 677^2 .

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (20771371) 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, 5192843 + ... + 5192846.

Almost surely, 2^20771378 is an apocalyptic number.

20771378 is a deficient number, since it is larger than the sum of its proper divisors (10385692).

20771378 is a wasteful number, since it uses less digits than its factorization.

20771378 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10385691.

The product of its (nonzero) digits is 16464, while the sum is 35.

The square root of 20771378 is about 4557.5627258437. The cubic root of 20771378 is about 274.8875705702.

The spelling of 20771378 in words is "twenty million, seven hundred seventy-one thousand, three hundred seventy-eight".