20604155 has 16 divisors (see below), whose sum is σ = 29048544. Its totient is φ = 13831680.

The previous prime is 20604149. The next prime is 20604173. The reversal of 20604155 is 55140602.

It is not a de Polignac number, because 20604155 - 2⁴ = 20604139 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20604155.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13694 + ... + 15123.

It is an arithmetic number, because the mean of its divisors is an integer number (1815534).

Almost surely, 2^20604155 is an apocalyptic number.

20604155 is a deficient number, since it is larger than the sum of its proper divisors (8444389).

20604155 is a wasteful number, since it uses less digits than its factorization.

20604155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28846.

The product of its (nonzero) digits is 1200, while the sum is 23.

The square root of 20604155 is about 4539.1799920250. The cubic root of 20604155 is about 274.1479079602.

Adding to 20604155 its reverse (55140602), we get a palindrome (75744757).

The spelling of 20604155 in words is "twenty million, six hundred four thousand, one hundred fifty-five".