20213123 has 8 divisors (see below), whose sum is σ = 23664480. Its totient is φ = 16902720.

The previous prime is 20213107. The next prime is 20213183. The reversal of 20213123 is 32131202.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 20213123 - 2⁴ = 20213107 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20213098 and 20213107.

It is not an unprimeable number, because it can be changed into a prime (20213183) 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, 34928 + ... + 35501.

It is an arithmetic number, because the mean of its divisors is an integer number (2958060).

Almost surely, 2^20213123 is an apocalyptic number.

20213123 is a deficient number, since it is larger than the sum of its proper divisors (3451357).

20213123 is an equidigital number, since it uses as much as digits as its factorization.

20213123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70477.

The product of its (nonzero) digits is 72, while the sum is 14.

The square root of 20213123 is about 4495.9006884049. The cubic root of 20213123 is about 272.4025317044.

Adding to 20213123 its reverse (32131202), we get a palindrome (52344325).

The spelling of 20213123 in words is "twenty million, two hundred thirteen thousand, one hundred twenty-three".