20153545 has 4 divisors (see below), whose sum is σ = 24184260. Its totient is φ = 16122832.

The previous prime is 20153531. The next prime is 20153561. The reversal of 20153545 is 54535102.

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 10936249 + 9217296 = 3307^2 + 3036^2 .

It is a cyclic number.

It is not a de Polignac number, because 20153545 - 2⁵ = 20153513 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2015350 + ... + 2015359.

It is an arithmetic number, because the mean of its divisors is an integer number (6046065).

Almost surely, 2^20153545 is an apocalyptic number.

It is an amenable number.

20153545 is a deficient number, since it is larger than the sum of its proper divisors (4030715).

20153545 is an equidigital number, since it uses as much as digits as its factorization.

20153545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4030714.

The product of its (nonzero) digits is 3000, while the sum is 25.

The square root of 20153545 is about 4489.2699851980. The cubic root of 20153545 is about 272.1346336441.

Adding to 20153545 its reverse (54535102), we get a palindrome (74688647).

The spelling of 20153545 in words is "twenty million, one hundred fifty-three thousand, five hundred forty-five".