20212858 has 8 divisors (see below), whose sum is σ = 30396852. Its totient is φ = 10080576.

The previous prime is 20212853. The next prime is 20212889. The reversal of 20212858 is 85821202.

It can be written as a sum of positive squares in 2 ways, for example, as 19158129 + 1054729 = 4377^2 + 1027^2 .

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

It is not an unprimeable number, because it can be changed into a prime (20212853) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11935 + ... + 13522.

Almost surely, 2^20212858 is an apocalyptic number.

20212858 is a deficient number, since it is larger than the sum of its proper divisors (10183994).

20212858 is a wasteful number, since it uses less digits than its factorization.

20212858 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25856.

The product of its (nonzero) digits is 2560, while the sum is 28.

The square root of 20212858 is about 4495.8712170168. The cubic root of 20212858 is about 272.4013412734.

It can be divided in two parts, 20 and 212858, that added together give a triangular number (212878 = T₆₅₂).

The spelling of 20212858 in words is "twenty million, two hundred twelve thousand, eight hundred fifty-eight".