20381386 has 4 divisors (see below), whose sum is σ = 30572082. Its totient is φ = 10190692.

The previous prime is 20381369. The next prime is 20381399. The reversal of 20381386 is 68318302.

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., 19847025 + 534361 = 4455^2 + 731^2 .

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5095345 + ... + 5095348.

Almost surely, 2^20381386 is an apocalyptic number.

20381386 is a deficient number, since it is larger than the sum of its proper divisors (10190696).

20381386 is a wasteful number, since it uses less digits than its factorization.

20381386 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10190695.

The product of its (nonzero) digits is 6912, while the sum is 31.

The square root of 20381386 is about 4514.5748415549. The cubic root of 20381386 is about 273.1563104545.

Adding to 20381386 its reverse (68318302), we get a palindrome (88699688).

The spelling of 20381386 in words is "twenty million, three hundred eighty-one thousand, three hundred eighty-six".