20926858 has 8 divisors (see below), whose sum is σ = 31564260. Its totient is φ = 10405440.

The previous prime is 20926831. The next prime is 20926859. The reversal of 20926858 is 85862902.

It can be written as a sum of positive squares in 2 ways, for example, as 18292729 + 2634129 = 4277^2 + 1623^2 .

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

It is a self number, because there is not a number n which added to its sum of digits gives 20926858.

It is not an unprimeable number, because it can be changed into a prime (20926859) 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, 28543 + ... + 29266.

Almost surely, 2^20926858 is an apocalyptic number.

20926858 is a deficient number, since it is larger than the sum of its proper divisors (10637402).

20926858 is a wasteful number, since it uses less digits than its factorization.

20926858 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57992.

The product of its (nonzero) digits is 69120, while the sum is 40.

The square root of 20926858 is about 4574.5882874856. The cubic root of 20926858 is about 275.5717383282.

The spelling of 20926858 in words is "twenty million, nine hundred twenty-six thousand, eight hundred fifty-eight".