20565103 has 6 divisors (see below), whose sum is σ = 22268904. Its totient is φ = 18983016.

The previous prime is 20565101. The next prime is 20565107. The reversal of 20565103 is 30156502.

It is a happy number.

It is not a de Polignac number, because 20565103 - 2¹ = 20565101 is a prime.

It is a super-2 number, since 2×20565103² = 845846922801218, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20565101) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 60675 + ... + 61012.

It is an arithmetic number, because the mean of its divisors is an integer number (3711484).

Almost surely, 2^20565103 is an apocalyptic number.

20565103 is a deficient number, since it is larger than the sum of its proper divisors (1703801).

20565103 is a wasteful number, since it uses less digits than its factorization.

20565103 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 121713 (or 121700 counting only the distinct ones).

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

The square root of 20565103 is about 4534.8762937924. The cubic root of 20565103 is about 273.9745967178.

The spelling of 20565103 in words is "twenty million, five hundred sixty-five thousand, one hundred three".