20604545 has 16 divisors (see below), whose sum is σ = 27134352. Its totient is φ = 14926080.

The previous prime is 20604541. The next prime is 20604547. The reversal of 20604545 is 54540602.

It can be written as a sum of positive squares in 8 ways, for example, as 4096576 + 16507969 = 2024^2 + 4063^2 .

It is not a de Polignac number, because 20604545 - 2² = 20604541 is a prime.

It is a Duffinian number.

20604545 is a modest number, since divided by 4545 gives 2060 as remainder.

It is not an unprimeable number, because it can be changed into a prime (20604541) 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, 455 + ... + 6435.

It is an arithmetic number, because the mean of its divisors is an integer number (1695897).

Almost surely, 2^20604545 is an apocalyptic number.

It is an amenable number.

20604545 is a deficient number, since it is larger than the sum of its proper divisors (6529807).

20604545 is a wasteful number, since it uses less digits than its factorization.

20604545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6052.

The product of its (nonzero) digits is 4800, while the sum is 26.

The square root of 20604545 is about 4539.2229511228. Note that the first 3 decimals coincide. The cubic root of 20604545 is about 274.1496376600.

It can be divided in two parts, 206045 and 45, that multiplied together give a square (9272025 = 3045²).

The spelling of 20604545 in words is "twenty million, six hundred four thousand, five hundred forty-five".