20155043 has 4 divisors (see below), whose sum is σ = 20164128.
Its totient is φ = 20145960.
The previous prime is 20155039. The next prime is 20155073. The reversal of 20155043 is 34055102.
It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 34055102 = 2 ⋅17027551.
It is a cyclic number.
It is not a de Polignac number, because 20155043 - 22 = 20155039 is a prime.
It is a Duffinian number.
It is not an unprimeable number, because it can be changed into a prime (20155073) by changing a digit.
It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1238 + ... + 6468.
It is an arithmetic number, because the mean of its divisors is an integer number (5041032).
Almost surely, 220155043 is an apocalyptic number.
20155043 is a deficient number, since it is larger than the sum of its proper divisors (9085).
20155043 is an equidigital number, since it uses as much as digits as its factorization.
20155043 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 9084.
The product of its (nonzero) digits is 600, while the sum is 20.
The square root of 20155043 is about 4489.4368243690.
The cubic root of 20155043 is about 272.1413760076.
The spelling of 20155043 in words is "twenty million, one hundred fifty-five thousand, forty-three".