20213859 has 4 divisors (see below), whose sum is σ = 26951816. Its totient is φ = 13475904.

The previous prime is 20213857. The next prime is 20213873. The reversal of 20213859 is 95831202.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 20213859 - 2¹ = 20213857 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20213857) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3368974 + ... + 3368979.

It is an arithmetic number, because the mean of its divisors is an integer number (6737954).

Almost surely, 2^20213859 is an apocalyptic number.

20213859 is a deficient number, since it is larger than the sum of its proper divisors (6737957).

20213859 is an equidigital number, since it uses as much as digits as its factorization.

20213859 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6737956.

The product of its (nonzero) digits is 4320, while the sum is 30.

The square root of 20213859 is about 4495.9825400017. The cubic root of 20213859 is about 272.4058379035.

The spelling of 20213859 in words is "twenty million, two hundred thirteen thousand, eight hundred fifty-nine".