20603155 has 16 divisors (see below), whose sum is σ = 25617024. Its totient is φ = 15897600.

The previous prime is 20603129. The next prime is 20603159. The reversal of 20603155 is 55130602.

It is a happy number.

It is not a de Polignac number, because 20603155 - 2⁵ = 20603123 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20603159) 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, 16555 + ... + 17755.

It is an arithmetic number, because the mean of its divisors is an integer number (1601064).

Almost surely, 2^20603155 is an apocalyptic number.

20603155 is a deficient number, since it is larger than the sum of its proper divisors (5013869).

20603155 is a wasteful number, since it uses less digits than its factorization.

20603155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1326.

The product of its (nonzero) digits is 900, while the sum is 22.

The square root of 20603155 is about 4539.0698386343. The cubic root of 20603155 is about 274.1434727327.

Adding to 20603155 its reverse (55130602), we get a palindrome (75733757).

The spelling of 20603155 in words is "twenty million, six hundred three thousand, one hundred fifty-five".