20810659662 has 72 divisors (see below), whose sum is σ = 50400237888. Its totient is φ = 6196694400.

The previous prime is 20810659619. The next prime is 20810659669. The reversal of 20810659662 is 26695601802.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20810659669) 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 35 ways as a sum of consecutive naturals, for example, 16039 + ... + 204642.

It is an arithmetic number, because the mean of its divisors is an integer number (700003304).

Almost surely, 2^20810659662 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20810659662, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25200118944).

20810659662 is an abundant number, since it is smaller than the sum of its proper divisors (29589578226).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20810659662 is a wasteful number, since it uses less digits than its factorization.

20810659662 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 220746 (or 220730 counting only the distinct ones).

The product of its (nonzero) digits is 311040, while the sum is 45.

The spelling of 20810659662 in words is "twenty billion, eight hundred ten million, six hundred fifty-nine thousand, six hundred sixty-two".