20828858 has 4 divisors (see below), whose sum is σ = 31243290. Its totient is φ = 10414428.

The previous prime is 20828851. The next prime is 20828867. The reversal of 20828858 is 85882802.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 85882802 = 2 ⋅42941401.

It can be written as a sum of positive squares in only one way, i.e., 10608049 + 10220809 = 3257^2 + 3197^2 .

It is not an unprimeable number, because it can be changed into a prime (20828851) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5207213 + ... + 5207216.

Almost surely, 2^20828858 is an apocalyptic number.

20828858 is a deficient number, since it is larger than the sum of its proper divisors (10414432).

20828858 is a wasteful number, since it uses less digits than its factorization.

20828858 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10414431.

The product of its (nonzero) digits is 81920, while the sum is 41.

The square root of 20828858 is about 4563.8643713415. The cubic root of 20828858 is about 275.1408996968.

The spelling of 20828858 in words is "twenty million, eight hundred twenty-eight thousand, eight hundred fifty-eight".