20829916865 has 8 divisors (see below), whose sum is σ = 24996681600. Its totient is φ = 16663412592.

The previous prime is 20829916841. The next prime is 20829917021. The reversal of 20829916865 is 56861992802.

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 20829916865 - 2⁸ = 20829916609 is a prime.

It is a super-2 number, since 2×20829916865² (a number of 21 digits) contains 22 as substring.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 20829916865.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 245786 + ... + 319484.

It is an arithmetic number, because the mean of its divisors is an integer number (3124585200).

Almost surely, 2^20829916865 is an apocalyptic number.

It is an amenable number.

20829916865 is a deficient number, since it is larger than the sum of its proper divisors (4166764735).

20829916865 is an equidigital number, since it uses as much as digits as its factorization.

20829916865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 130231.

The product of its (nonzero) digits is 3732480, while the sum is 56.

The spelling of 20829916865 in words is "twenty billion, eight hundred twenty-nine million, nine hundred sixteen thousand, eight hundred sixty-five".