20386331 has 4 divisors (see below), whose sum is σ = 23298672. Its totient is φ = 17473992.

The previous prime is 20386319. The next prime is 20386337. The reversal of 20386331 is 13368302.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13368302 = 2 ⋅6684151.

It is a cyclic number.

It is not a de Polignac number, because 20386331 - 2²² = 16192027 is a prime.

It is a super-2 number, since 2×20386331² = 831204983283122, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20386331.

It is not an unprimeable number, because it can be changed into a prime (20386337) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1456160 + ... + 1456173.

It is an arithmetic number, because the mean of its divisors is an integer number (5824668).

Almost surely, 2^20386331 is an apocalyptic number.

20386331 is a deficient number, since it is larger than the sum of its proper divisors (2912341).

20386331 is an equidigital number, since it uses as much as digits as its factorization.

20386331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2912340.

The product of its (nonzero) digits is 2592, while the sum is 26.

The square root of 20386331 is about 4515.1224789589. The cubic root of 20386331 is about 273.1784000338.

The spelling of 20386331 in words is "twenty million, three hundred eighty-six thousand, three hundred thirty-one".