20151445 has 8 divisors (see below), whose sum is σ = 24216120. Its totient is φ = 16098240.

The previous prime is 20151407. The next prime is 20151449. The reversal of 20151445 is 54415102.

It can be written as a sum of positive squares in 4 ways, for example, as 5574321 + 14577124 = 2361^2 + 3818^2 .

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

It is not a de Polignac number, because 20151445 - 2¹⁵ = 20118677 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20151449) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1651 + ... + 6559.

It is an arithmetic number, because the mean of its divisors is an integer number (3027015).

Almost surely, 2^20151445 is an apocalyptic number.

It is an amenable number.

20151445 is a deficient number, since it is larger than the sum of its proper divisors (4064675).

20151445 is an equidigital number, since it uses as much as digits as its factorization.

20151445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5735.

The product of its (nonzero) digits is 800, while the sum is 22.

The square root of 20151445 is about 4489.0360880706. The cubic root of 20151445 is about 272.1251811700.

Adding to 20151445 its reverse (54415102), we get a palindrome (74566547).

The spelling of 20151445 in words is "twenty million, one hundred fifty-one thousand, four hundred forty-five".