20100244145 has 4 divisors (see below), whose sum is σ = 24120292980. Its totient is φ = 16080195312.

The previous prime is 20100244141. The next prime is 20100244159. The reversal of 20100244145 is 54144200102.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 54144200102 = 2 ⋅27072100051.

It can be written as a sum of positive squares in 2 ways, for example, as 15956489761 + 4143754384 = 126319^2 + 64372^2 .

It is a cyclic number.

It is not a de Polignac number, because 20100244145 - 2² = 20100244141 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20100244145.

It is not an unprimeable number, because it can be changed into a prime (20100244141) 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, 2010024410 + ... + 2010024419.

It is an arithmetic number, because the mean of its divisors is an integer number (6030073245).

Almost surely, 2^20100244145 is an apocalyptic number.

It is an amenable number.

20100244145 is a deficient number, since it is larger than the sum of its proper divisors (4020048835).

20100244145 is an equidigital number, since it uses as much as digits as its factorization.

20100244145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4020048834.

The product of its (nonzero) digits is 1280, while the sum is 23.

Adding to 20100244145 its reverse (54144200102), we get a palindrome (74244444247).

The spelling of 20100244145 in words is "twenty billion, one hundred million, two hundred forty-four thousand, one hundred forty-five".