20101662 has 96 divisors (see below), whose sum is σ = 53187840. Its totient is φ = 5609520.

The previous prime is 20101661. The next prime is 20101663. The reversal of 20101662 is 26610102.

It is a happy number.

20101662 is a `hidden beast` number, since 2 + 0 + 1 + 0 + 1 + 662 = 666.

It is an interprime number because it is at equal distance from previous prime (20101661) and next prime (20101663).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20101661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 187813 + ... + 187919.

It is an arithmetic number, because the mean of its divisors is an integer number (554040).

Almost surely, 2^20101662 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20101662, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26593920).

20101662 is an abundant number, since it is smaller than the sum of its proper divisors (33086178).

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

20101662 is a wasteful number, since it uses less digits than its factorization.

20101662 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 203 (or 190 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

The square root of 20101662 is about 4483.4877049012. The cubic root of 20101662 is about 271.9009064493.

Adding to 20101662 its reverse (26610102), we get a palindrome (46711764).

The spelling of 20101662 in words is "twenty million, one hundred one thousand, six hundred sixty-two".