20745100219 has 4 divisors (see below), whose sum is σ = 20869322544. Its totient is φ = 20620877896.

The previous prime is 20745100199. The next prime is 20745100237. The reversal of 20745100219 is 91200154702.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20745100219 is a prime.

It is a super-2 number, since 2×20745100219² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20745100249) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 62110912 + ... + 62111245.

It is an arithmetic number, because the mean of its divisors is an integer number (5217330636).

Almost surely, 2^20745100219 is an apocalyptic number.

20745100219 is a deficient number, since it is larger than the sum of its proper divisors (124222325).

20745100219 is a wasteful number, since it uses less digits than its factorization.

20745100219 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 124222324.

The product of its (nonzero) digits is 5040, while the sum is 31.

The spelling of 20745100219 in words is "twenty billion, seven hundred forty-five million, one hundred thousand, two hundred nineteen".