20805103 has 12 divisors (see below), whose sum is σ = 23051560. Its totient is φ = 18762480.

The previous prime is 20805101. The next prime is 20805107. The reversal of 20805103 is 30150802.

It is a happy number.

It is not a de Polignac number, because 20805103 - 2¹ = 20805101 is a prime.

It is a super-4 number, since 4×20805103⁴ (a number of 30 digits) contains 4444 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 (20805101) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 16201 + ... + 17437.

Almost surely, 2^20805103 is an apocalyptic number.

20805103 is a deficient number, since it is larger than the sum of its proper divisors (2246457).

20805103 is a wasteful number, since it uses less digits than its factorization.

20805103 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1398 (or 1387 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 19.

The square root of 20805103 is about 4561.2611194712. The cubic root of 20805103 is about 275.0362618849.

Adding to 20805103 its reverse (30150802), we get a palindrome (50955905).

The spelling of 20805103 in words is "twenty million, eight hundred five thousand, one hundred three".