20011213 has 8 divisors (see below), whose sum is σ = 20738816. Its totient is φ = 19288800.

The previous prime is 20011177. The next prime is 20011249. The reversal of 20011213 is 31211002.

It is an interprime number because it is at equal distance from previous prime (20011177) and next prime (20011249).

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 20011213 - 2⁹ = 20010701 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20011213.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20011273) 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, 7633 + ... + 9913.

It is an arithmetic number, because the mean of its divisors is an integer number (2592352).

Almost surely, 2^20011213 is an apocalyptic number.

It is an amenable number.

20011213 is a deficient number, since it is larger than the sum of its proper divisors (727603).

20011213 is a wasteful number, since it uses less digits than its factorization.

20011213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2595.

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

The square root of 20011213 is about 4473.3894308455. The cubic root of 20011213 is about 271.4924801235.

Adding to 20011213 its reverse (31211002), we get a palindrome (51222215).

The spelling of 20011213 in words is "twenty million, eleven thousand, two hundred thirteen".