20123011 has 4 divisors (see below), whose sum is σ = 20591032. Its totient is φ = 19654992.

The previous prime is 20122997. The next prime is 20123017. The reversal of 20123011 is 11032102.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20123011 - 2⁵ = 20122979 is a prime.

It is a super-2 number, since 2×20123011² = 809871143412242, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20123017) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 233946 + ... + 234031.

It is an arithmetic number, because the mean of its divisors is an integer number (5147758).

Almost surely, 2^20123011 is an apocalyptic number.

20123011 is a deficient number, since it is larger than the sum of its proper divisors (468021).

20123011 is an equidigital number, since it uses as much as digits as its factorization.

20123011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 468020.

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

The square root of 20123011 is about 4485.8679204809. The cubic root of 20123011 is about 271.9971299798.

Adding to 20123011 its reverse (11032102), we get a palindrome (31155113).

Subtracting from 20123011 its reverse (11032102), we obtain a palindrome (9090909).

The spelling of 20123011 in words is "twenty million, one hundred twenty-three thousand, eleven".