18620929309 has 16 divisors (see below), whose sum is σ = 20288634880. Its totient is φ = 17025104880.

The previous prime is 18620929303. The next prime is 18620929333. The reversal of 18620929309 is 90392902681.

It is a cyclic number.

It is not a de Polignac number, because 18620929309 - 2³³ = 10030994717 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18620929303) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 173092 + ... + 259234.

It is an arithmetic number, because the mean of its divisors is an integer number (1268039680).

Almost surely, 2^18620929309 is an apocalyptic number.

18620929309 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

18620929309 is a deficient number, since it is larger than the sum of its proper divisors (1667705571).

18620929309 is a wasteful number, since it uses less digits than its factorization.

18620929309 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86560.

The product of its (nonzero) digits is 419904, while the sum is 49.

The spelling of 18620929309 in words is "eighteen billion, six hundred twenty million, nine hundred twenty-nine thousand, three hundred nine".