20019243 has 4 divisors (see below), whose sum is σ = 26692328. Its totient is φ = 13346160.

The previous prime is 20019229. The next prime is 20019247. The reversal of 20019243 is 34291002.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 20019243 - 2¹² = 20015147 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20019247) 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, 3336538 + ... + 3336543.

It is an arithmetic number, because the mean of its divisors is an integer number (6673082).

Almost surely, 2^20019243 is an apocalyptic number.

20019243 is a deficient number, since it is larger than the sum of its proper divisors (6673085).

20019243 is an equidigital number, since it uses as much as digits as its factorization.

20019243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6673084.

The product of its (nonzero) digits is 432, while the sum is 21.

The square root of 20019243 is about 4474.2868705527. The cubic root of 20019243 is about 271.5287896511.

The spelling of 20019243 in words is "twenty million, nineteen thousand, two hundred forty-three".