20830808661 has 8 divisors (see below), whose sum is σ = 29910904800. Its totient is φ = 12818959152.

The previous prime is 20830808629. The next prime is 20830808681. The reversal of 20830808661 is 16680803802.

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

It is not a de Polignac number, because 20830808661 - 2⁵ = 20830808629 is a prime.

It is a super-2 number, since 2×20830808661² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20830808681) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 267061611 + ... + 267061688.

It is an arithmetic number, because the mean of its divisors is an integer number (3738863100).

Almost surely, 2^20830808661 is an apocalyptic number.

It is an amenable number.

20830808661 is a deficient number, since it is larger than the sum of its proper divisors (9080096139).

20830808661 is a wasteful number, since it uses less digits than its factorization.

20830808661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 534123315.

The product of its (nonzero) digits is 110592, while the sum is 42.

The spelling of 20830808661 in words is "twenty billion, eight hundred thirty million, eight hundred eight thousand, six hundred sixty-one".