20107156 has 6 divisors (see below), whose sum is σ = 35187530. Its totient is φ = 10053576.

The previous prime is 20107151. The next prime is 20107163. The reversal of 20107156 is 65170102.

It can be written as a sum of positive squares in only one way, i.e., 20106256 + 900 = 4484^2 + 30^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20107151) 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 as a sum of consecutive naturals, namely, 2513391 + ... + 2513398.

Almost surely, 2^20107156 is an apocalyptic number.

It is an amenable number.

20107156 is a deficient number, since it is larger than the sum of its proper divisors (15080374).

20107156 is a wasteful number, since it uses less digits than its factorization.

20107156 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5026793 (or 5026791 counting only the distinct ones).

The product of its (nonzero) digits is 420, while the sum is 22.

The square root of 20107156 is about 4484.1003557012. The cubic root of 20107156 is about 271.9256753384.

Adding to 20107156 its reverse (65170102), we get a palindrome (85277258).

The spelling of 20107156 in words is "twenty million, one hundred seven thousand, one hundred fifty-six".