20106156 has 48 divisors (see below), whose sum is σ = 54141696. Its totient is φ = 5688384.

The previous prime is 20106143. The next prime is 20106157. The reversal of 20106156 is 65160102.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is not an unprimeable number, because it can be changed into a prime (20106157) 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 15 ways as a sum of consecutive naturals, for example, 7870 + ... + 10106.

It is an arithmetic number, because the mean of its divisors is an integer number (1127952).

Almost surely, 2^20106156 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20106156, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27070848).

20106156 is an abundant number, since it is smaller than the sum of its proper divisors (34035540).

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

20106156 is a wasteful number, since it uses less digits than its factorization.

20106156 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2358 (or 2356 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 21.

The square root of 20106156 is about 4483.9888492279. The cubic root of 20106156 is about 271.9211673217.

Adding to 20106156 its reverse (65160102), we get a palindrome (85266258).

The spelling of 20106156 in words is "twenty million, one hundred six thousand, one hundred fifty-six".