20437700166 has 112 divisors (see below), whose sum is σ = 49628058480. Its totient is φ = 6272199360.

The previous prime is 20437700161. The next prime is 20437700183. The reversal of 20437700166 is 66100773402.

It is a self number, because there is not a number n which added to its sum of digits gives 20437700166.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20437700161) by changing a digit.

It is a polite number, since it can be written in 55 ways as a sum of consecutive naturals, for example, 8736625 + ... + 8738963.

It is an arithmetic number, because the mean of its divisors is an integer number (443107665).

Almost surely, 2^20437700166 is an apocalyptic number.

20437700166 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 20437700166, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24814029240).

20437700166 is an abundant number, since it is smaller than the sum of its proper divisors (29190358314).

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

20437700166 is a wasteful number, since it uses less digits than its factorization.

20437700166 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2833 (or 2818 counting only the distinct ones).

The product of its (nonzero) digits is 42336, while the sum is 36.

The spelling of 20437700166 in words is "twenty billion, four hundred thirty-seven million, seven hundred thousand, one hundred sixty-six".