20106756 has 18 divisors (see below), whose sum is σ = 50825502. Its totient is φ = 6702240.

The previous prime is 20106743. The next prime is 20106763. The reversal of 20106756 is 65760102.

It can be written as a sum of positive squares in only one way, i.e., 12489156 + 7617600 = 3534^2 + 2760^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 279225 + ... + 279296.

It is an arithmetic number, because the mean of its divisors is an integer number (2823639).

Almost surely, 2^20106756 is an apocalyptic number.

It is an amenable number.

20106756 is an abundant number, since it is smaller than the sum of its proper divisors (30718746).

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

20106756 is a wasteful number, since it uses less digits than its factorization.

20106756 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 558531 (or 558526 counting only the distinct ones).

The product of its (nonzero) digits is 2520, while the sum is 27.

The square root of 20106756 is about 4484.0557534446. The cubic root of 20106756 is about 271.9238721496.

Adding to 20106756 its reverse (65760102), we get a palindrome (85866858).

The spelling of 20106756 in words is "twenty million, one hundred six thousand, seven hundred fifty-six".