20165105 has 8 divisors (see below), whose sum is σ = 24225000. Its totient is φ = 16114176.

The previous prime is 20165081. The next prime is 20165129. The reversal of 20165105 is 50156102.

It is an interprime number because it is at equal distance from previous prime (20165081) and next prime (20165129).

It can be written as a sum of positive squares in 4 ways, for example, as 602176 + 19562929 = 776^2 + 4423^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20165105 is a prime.

It is a super-2 number, since 2×20165105² = 813262919322050, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4631 + ... + 7859.

It is an arithmetic number, because the mean of its divisors is an integer number (3028125).

Almost surely, 2^20165105 is an apocalyptic number.

It is an amenable number.

20165105 is a deficient number, since it is larger than the sum of its proper divisors (4059895).

20165105 is a wasteful number, since it uses less digits than its factorization.

20165105 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4483.

The product of its (nonzero) digits is 300, while the sum is 20.

The square root of 20165105 is about 4490.5573150779. The cubic root of 20165105 is about 272.1866555103.

The spelling of 20165105 in words is "twenty million, one hundred sixty-five thousand, one hundred five".