20604045 has 32 divisors (see below), whose sum is σ = 41103360. Its totient is φ = 8562240.

The previous prime is 20604019. The next prime is 20604047. The reversal of 20604045 is 54040602.

It is a happy number.

It is not a de Polignac number, because 20604045 - 2⁵ = 20604013 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20604047) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 7765 + ... + 10074.

It is an arithmetic number, because the mean of its divisors is an integer number (1284480).

Almost surely, 2^20604045 is an apocalyptic number.

It is an amenable number.

20604045 is a deficient number, since it is larger than the sum of its proper divisors (20499315).

20604045 is a wasteful number, since it uses less digits than its factorization.

20604045 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17865.

The product of its (nonzero) digits is 960, while the sum is 21.

The square root of 20604045 is about 4539.1678752829. The cubic root of 20604045 is about 274.1474200922.

Adding to 20604045 its reverse (54040602), we get a palindrome (74644647).

It can be divided in two parts, 2060 and 4045, that added together give a triangular number (6105 = T₁₁₀).

The spelling of 20604045 in words is "twenty million, six hundred four thousand, forty-five".