20120213 has 2 divisors, whose sum is σ = 20120214. Its totient is φ = 20120212.

The previous prime is 20120207. The next prime is 20120237. The reversal of 20120213 is 31202102.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11957764 + 8162449 = 3458^2 + 2857^2 .

It is a cyclic number.

It is not a de Polignac number, because 20120213 - 2¹⁰ = 20119189 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 20120194 and 20120203.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20120203) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10060106 + 10060107.

It is an arithmetic number, because the mean of its divisors is an integer number (10060107).

Almost surely, 2^20120213 is an apocalyptic number.

It is an amenable number.

20120213 is a deficient number, since it is larger than the sum of its proper divisors (1).

20120213 is an equidigital number, since it uses as much as digits as its factorization.

20120213 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 24, while the sum is 11.

The square root of 20120213 is about 4485.5560413398. The cubic root of 20120213 is about 271.9845228001.

Adding to 20120213 its reverse (31202102), we get a palindrome (51322315).

The spelling of 20120213 in words is "twenty million, one hundred twenty thousand, two hundred thirteen".