20355213 has 8 divisors (see below), whose sum is σ = 28568800. Its totient is φ = 12855888.

The previous prime is 20355193. The next prime is 20355221. The reversal of 20355213 is 31255302.

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

It is not a de Polignac number, because 20355213 - 2⁶ = 20355149 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 20355213.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20353213) 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, 178498 + ... + 178611.

It is an arithmetic number, because the mean of its divisors is an integer number (3571100).

Almost surely, 2^20355213 is an apocalyptic number.

It is an amenable number.

20355213 is a deficient number, since it is larger than the sum of its proper divisors (8213587).

20355213 is a wasteful number, since it uses less digits than its factorization.

20355213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 357131.

The product of its (nonzero) digits is 900, while the sum is 21.

The square root of 20355213 is about 4511.6751877767. The cubic root of 20355213 is about 273.0393347232.

The spelling of 20355213 in words is "twenty million, three hundred fifty-five thousand, two hundred thirteen".