20705826 has 32 divisors (see below), whose sum is σ = 43223040. Its totient is φ = 6604416.

The previous prime is 20705809. The next prime is 20705827. The reversal of 20705826 is 62850702.

It is a junction number, because it is equal to n+sod(n) for n = 20705793 and 20705802.

It is not an unprimeable number, because it can be changed into a prime (20705827) 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 15 ways as a sum of consecutive naturals, for example, 21630 + ... + 22566.

It is an arithmetic number, because the mean of its divisors is an integer number (1350720).

Almost surely, 2^20705826 is an apocalyptic number.

20705826 is an abundant number, since it is smaller than the sum of its proper divisors (22517214).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20705826 is a wasteful number, since it uses less digits than its factorization.

20705826 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1098.

The product of its (nonzero) digits is 6720, while the sum is 30.

The square root of 20705826 is about 4550.3654798269. The cubic root of 20705826 is about 274.5980950066.

The spelling of 20705826 in words is "twenty million, seven hundred five thousand, eight hundred twenty-six".