20445135 has 16 divisors (see below), whose sum is σ = 34636896. Its totient is φ = 10262528.

The previous prime is 20445109. The next prime is 20445143. The reversal of 20445135 is 53154402.

It is a cyclic number.

It is not a de Polignac number, because 20445135 - 2⁶ = 20445071 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 39834 + ... + 40343.

It is an arithmetic number, because the mean of its divisors is an integer number (2164806).

Almost surely, 2^20445135 is an apocalyptic number.

20445135 is a deficient number, since it is larger than the sum of its proper divisors (14191761).

20445135 is a wasteful number, since it uses less digits than its factorization.

20445135 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80202.

The product of its (nonzero) digits is 2400, while the sum is 24.

The square root of 20445135 is about 4521.6296840852. The cubic root of 20445135 is about 273.4408072634.

Adding to 20445135 its reverse (53154402), we get a palindrome (73599537).

It can be divided in two parts, 20445 and 135, that multiplied together give a triangular number (2760075 = T₂₃₄₉).

The spelling of 20445135 in words is "twenty million, four hundred forty-five thousand, one hundred thirty-five".