20104545 has 16 divisors (see below), whose sum is σ = 32713920. Its totient is φ = 10540224.

The previous prime is 20104537. The next prime is 20104549. The reversal of 20104545 is 54540102.

It is not a de Polignac number, because 20104545 - 2³ = 20104537 is a prime.

20104545 is a modest number, since divided by 4545 gives 2010 as remainder.

It is not an unprimeable number, because it can be changed into a prime (20104549) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 10474 + ... + 12243.

It is an arithmetic number, because the mean of its divisors is an integer number (2044620).

Almost surely, 2^20104545 is an apocalyptic number.

It is an amenable number.

20104545 is a deficient number, since it is larger than the sum of its proper divisors (12609375).

20104545 is a wasteful number, since it uses less digits than its factorization.

20104545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22784.

The product of its (nonzero) digits is 800, while the sum is 21.

The square root of 20104545 is about 4483.8092064672. The cubic root of 20104545 is about 271.9139045925.

Adding to 20104545 its reverse (54540102), we get a palindrome (74644647).

It can be divided in two parts, 2010 and 4545, that added together give a triangular number (6555 = T₁₁₄).

The spelling of 20104545 in words is "twenty million, one hundred four thousand, five hundred forty-five".