20101156 has 12 divisors (see below), whose sum is σ = 35245168. Its totient is φ = 10031112.

The previous prime is 20101141. The next prime is 20101187. The reversal of 20101156 is 65110102.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2406 + ... + 6781.

Almost surely, 2^20101156 is an apocalyptic number.

It is an amenable number.

20101156 is a deficient number, since it is larger than the sum of its proper divisors (15144012).

20101156 is a wasteful number, since it uses less digits than its factorization.

20101156 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9738 (or 9736 counting only the distinct ones).

The product of its (nonzero) digits is 60, while the sum is 16.

The square root of 20101156 is about 4483.4312752623. The cubic root of 20101156 is about 271.8986249959.

Adding to 20101156 its reverse (65110102), we get a palindrome (85211258).

The spelling of 20101156 in words is "twenty million, one hundred one thousand, one hundred fifty-six".