20165550 has 24 divisors (see below), whose sum is σ = 50010936. Its totient is φ = 5377440.

The previous prime is 20165543. The next prime is 20165557. The reversal of 20165550 is 5556102.

It is an interprime number because it is at equal distance from previous prime (20165543) and next prime (20165557).

It is a self number, because there is not a number n which added to its sum of digits gives 20165550.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20165557) 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, 67069 + ... + 67368.

It is an arithmetic number, because the mean of its divisors is an integer number (2083789).

Almost surely, 2^20165550 is an apocalyptic number.

20165550 is an abundant number, since it is smaller than the sum of its proper divisors (29845386).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20165550 is a wasteful number, since it uses less digits than its factorization.

20165550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 134452 (or 134447 counting only the distinct ones).

The product of its (nonzero) digits is 1500, while the sum is 24.

The square root of 20165550 is about 4490.6068632202. The cubic root of 20165550 is about 272.1886576847.

The spelling of 20165550 in words is "twenty million, one hundred sixty-five thousand, five hundred fifty".