20381145 has 8 divisors (see below), whose sum is σ = 32609856. Its totient is φ = 10869936.

The previous prime is 20381107. The next prime is 20381149. The reversal of 20381145 is 54118302.

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

It is not a de Polignac number, because 20381145 - 2⁸ = 20380889 is a prime.

It is a super-2 number, since 2×20381145² = 830782143022050, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (20381149) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 679357 + ... + 679386.

It is an arithmetic number, because the mean of its divisors is an integer number (4076232).

Almost surely, 2^20381145 is an apocalyptic number.

It is an amenable number.

20381145 is a deficient number, since it is larger than the sum of its proper divisors (12228711).

20381145 is a wasteful number, since it uses less digits than its factorization.

20381145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1358751.

The product of its (nonzero) digits is 960, while the sum is 24.

The square root of 20381145 is about 4514.5481501475. The cubic root of 20381145 is about 273.1552338033.

Adding to 20381145 its reverse (54118302), we get a palindrome (74499447).

The spelling of 20381145 in words is "twenty million, three hundred eighty-one thousand, one hundred forty-five".