20823213 has 8 divisors (see below), whose sum is σ = 27841408. Its totient is φ = 13843584.

The previous prime is 20823169. The next prime is 20823239. The reversal of 20823213 is 31232802.

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

It is not a de Polignac number, because 20823213 - 2⁶ = 20823149 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 20823213.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20823263) 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, 8356 + ... + 10557.

It is an arithmetic number, because the mean of its divisors is an integer number (3480176).

Almost surely, 2^20823213 is an apocalyptic number.

It is an amenable number.

20823213 is a deficient number, since it is larger than the sum of its proper divisors (7018195).

20823213 is a wasteful number, since it uses less digits than its factorization.

20823213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19283.

The product of its (nonzero) digits is 576, while the sum is 21.

The square root of 20823213 is about 4563.2458842364. The cubic root of 20823213 is about 275.1160413854.

The spelling of 20823213 in words is "twenty million, eight hundred twenty-three thousand, two hundred thirteen".