20526145 has 4 divisors (see below), whose sum is σ = 24631380. Its totient is φ = 16420912.

The previous prime is 20526071. The next prime is 20526151. The reversal of 20526145 is 54162502.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2582449 + 17943696 = 1607^2 + 4236^2 .

It is a cyclic number.

It is not a de Polignac number, because 20526145 - 2⁹ = 20525633 is a prime.

It is a super-2 number, since 2×20526145² = 842645257122050, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2052610 + ... + 2052619.

It is an arithmetic number, because the mean of its divisors is an integer number (6157845).

Almost surely, 2^20526145 is an apocalyptic number.

It is an amenable number.

20526145 is a deficient number, since it is larger than the sum of its proper divisors (4105235).

20526145 is an equidigital number, since it uses as much as digits as its factorization.

20526145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4105234.

The product of its (nonzero) digits is 2400, while the sum is 25.

The square root of 20526145 is about 4530.5788813351. The cubic root of 20526145 is about 273.8014838915.

Adding to 20526145 its reverse (54162502), we get a palindrome (74688647).

The spelling of 20526145 in words is "twenty million, five hundred twenty-six thousand, one hundred forty-five".