20091792509 has 8 divisors (see below), whose sum is σ = 21181191168. Its totient is φ = 19029973680.

The previous prime is 20091792493. The next prime is 20091792551. The reversal of 20091792509 is 90529719002.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20091792509 - 2⁴ = 20091792493 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20091792509.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20091795509) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6893462 + ... + 6896375.

It is an arithmetic number, because the mean of its divisors is an integer number (2647648896).

Almost surely, 2^20091792509 is an apocalyptic number.

It is an amenable number.

20091792509 is a deficient number, since it is larger than the sum of its proper divisors (1089398659).

20091792509 is a wasteful number, since it uses less digits than its factorization.

20091792509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13789915.

The product of its (nonzero) digits is 102060, while the sum is 44.

The spelling of 20091792509 in words is "twenty billion, ninety-one million, seven hundred ninety-two thousand, five hundred nine".