20011123 has 8 divisors (see below), whose sum is σ = 22979520. Its totient is φ = 17234280.

The previous prime is 20011099. The next prime is 20011139. The reversal of 20011123 is 32111002.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20011123 is a prime.

It is a super-2 number, since 2×20011123² = 800890087442258, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20011153) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 47665 + ... + 48082.

It is an arithmetic number, because the mean of its divisors is an integer number (2872440).

Almost surely, 2^20011123 is an apocalyptic number.

20011123 is a deficient number, since it is larger than the sum of its proper divisors (2968397).

20011123 is a wasteful number, since it uses less digits than its factorization.

20011123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 95777.

The product of its (nonzero) digits is 12, while the sum is 10.

The square root of 20011123 is about 4473.3793713478. The cubic root of 20011123 is about 271.4920731123.

Adding to 20011123 its reverse (32111002), we get a palindrome (52122125).

The spelling of 20011123 in words is "twenty million, eleven thousand, one hundred twenty-three".