20719243 has 4 divisors (see below), whose sum is σ = 21938040. Its totient is φ = 19500448.

The previous prime is 20719217. The next prime is 20719247. The reversal of 20719243 is 34291702.

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

It is a cyclic number.

It is not a de Polignac number, because 20719243 - 2⁵ = 20719211 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20719247) 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, 609373 + ... + 609406.

It is an arithmetic number, because the mean of its divisors is an integer number (5484510).

Almost surely, 2^20719243 is an apocalyptic number.

20719243 is a deficient number, since it is larger than the sum of its proper divisors (1218797).

20719243 is a wasteful number, since it uses less digits than its factorization.

20719243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1218796.

The product of its (nonzero) digits is 3024, while the sum is 28.

The square root of 20719243 is about 4551.8395182607. The cubic root of 20719243 is about 274.6573937300.

The spelling of 20719243 in words is "twenty million, seven hundred nineteen thousand, two hundred forty-three".