20612342166 has 64 divisors (see below), whose sum is σ = 47430163200. Its totient is φ = 5918749056.

The previous prime is 20612342159. The next prime is 20612342167. The reversal of 20612342166 is 66124321602.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20612342167) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4501 + ... + 203088.

It is an arithmetic number, because the mean of its divisors is an integer number (741096300).

Almost surely, 2^20612342166 is an apocalyptic number.

20612342166 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 20612342166, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23715081600).

20612342166 is an abundant number, since it is smaller than the sum of its proper divisors (26817821034).

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

20612342166 is a wasteful number, since it uses less digits than its factorization.

20612342166 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 207693.

The product of its (nonzero) digits is 20736, while the sum is 33.

Adding to 20612342166 its reverse (66124321602), we get a palindrome (86736663768).

The spelling of 20612342166 in words is "twenty billion, six hundred twelve million, three hundred forty-two thousand, one hundred sixty-six".