20647378 has 4 divisors (see below), whose sum is σ = 30971070. Its totient is φ = 10323688.

The previous prime is 20647351. The next prime is 20647387. The reversal of 20647378 is 87374602.

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., 14160169 + 6487209 = 3763^2 + 2547^2 .

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 as a sum of consecutive naturals, namely, 5161843 + ... + 5161846.

Almost surely, 2^20647378 is an apocalyptic number.

20647378 is a deficient number, since it is larger than the sum of its proper divisors (10323692).

20647378 is a wasteful number, since it uses less digits than its factorization.

20647378 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10323691.

The product of its (nonzero) digits is 56448, while the sum is 37.

The square root of 20647378 is about 4543.9385999373. The cubic root of 20647378 is about 274.3394748034.

It can be divided in two parts, 20647 and 378, that added together give a square (21025 = 145²).

The spelling of 20647378 in words is "twenty million, six hundred forty-seven thousand, three hundred seventy-eight".