20801213 has 4 divisors (see below), whose sum is σ = 21243840. Its totient is φ = 20358588.

The previous prime is 20801191. The next prime is 20801243. The reversal of 20801213 is 31210802.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20801213 - 2¹⁶ = 20735677 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20801191 and 20801200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20801243) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 221243 + ... + 221336.

It is an arithmetic number, because the mean of its divisors is an integer number (5310960).

Almost surely, 2^20801213 is an apocalyptic number.

It is an amenable number.

20801213 is a deficient number, since it is larger than the sum of its proper divisors (442627).

20801213 is an equidigital number, since it uses as much as digits as its factorization.

20801213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 442626.

The product of its (nonzero) digits is 96, while the sum is 17.

The square root of 20801213 is about 4560.8346823800. The cubic root of 20801213 is about 275.0191193319.

The spelling of 20801213 in words is "twenty million, eight hundred one thousand, two hundred thirteen".