20219243699 has 4 divisors (see below), whose sum is σ = 21283414440. Its totient is φ = 19155072960.

The previous prime is 20219243659. The next prime is 20219243747. The reversal of 20219243699 is 99634291202.

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-20219243699 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20219243659) 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, 532085342 + ... + 532085379.

It is an arithmetic number, because the mean of its divisors is an integer number (5320853610).

Almost surely, 2^20219243699 is an apocalyptic number.

20219243699 is a deficient number, since it is larger than the sum of its proper divisors (1064170741).

20219243699 is a wasteful number, since it uses less digits than its factorization.

20219243699 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1064170740.

The product of its (nonzero) digits is 419904, while the sum is 47.

The spelling of 20219243699 in words is "twenty billion, two hundred nineteen million, two hundred forty-three thousand, six hundred ninety-nine".