20123213 has 8 divisors (see below), whose sum is σ = 22166976. Its totient is φ = 18115200.

The previous prime is 20123179. The next prime is 20123231. The reversal of 20123213 is 31232102.

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 20123213 - 2⁶ = 20123149 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20123263) 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, 7748 + ... + 10013.

It is an arithmetic number, because the mean of its divisors is an integer number (2770872).

Almost surely, 2^20123213 is an apocalyptic number.

It is an amenable number.

20123213 is a deficient number, since it is larger than the sum of its proper divisors (2043763).

20123213 is a wasteful number, since it uses less digits than its factorization.

20123213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17875.

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

The square root of 20123213 is about 4485.8904355769. The cubic root of 20123213 is about 271.9980401027.

Adding to 20123213 its reverse (31232102), we get a palindrome (51355315).

Subtracting 20123213 from its reverse (31232102), we obtain a square (11108889 = 3333²).

It can be divided in two parts, 2012 and 3213, that added together give a palindrome (5225).

The spelling of 20123213 in words is "twenty million, one hundred twenty-three thousand, two hundred thirteen".