20805006 has 16 divisors (see below), whose sum is σ = 43045200. Its totient is φ = 6695808.

The previous prime is 20804983. The next prime is 20805011. The reversal of 20805006 is 60050802.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 59611 + ... + 59958.

It is an arithmetic number, because the mean of its divisors is an integer number (2690325).

Almost surely, 2^20805006 is an apocalyptic number.

20805006 is an abundant number, since it is smaller than the sum of its proper divisors (22240194).

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

20805006 is a wasteful number, since it uses less digits than its factorization.

20805006 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 119603.

The product of its (nonzero) digits is 480, while the sum is 21.

The square root of 20805006 is about 4561.2504864346. The cubic root of 20805006 is about 275.0358344488.

Adding to 20805006 its reverse (60050802), we get a palindrome (80855808).

The spelling of 20805006 in words is "twenty million, eight hundred five thousand, six".