20905010 has 32 divisors (see below), whose sum is σ = 43604352. Its totient is φ = 7067520.

The previous prime is 20905007. The next prime is 20905033. The reversal of 20905010 is 1050902.

It is a self number, because there is not a number n which added to its sum of digits gives 20905010.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3065 + ... + 7155.

It is an arithmetic number, because the mean of its divisors is an integer number (1362636).

Almost surely, 2^20905010 is an apocalyptic number.

20905010 is an abundant number, since it is smaller than the sum of its proper divisors (22699342).

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

20905010 is a wasteful number, since it uses less digits than its factorization.

20905010 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4178.

The product of its (nonzero) digits is 90, while the sum is 17.

The square root of 20905010 is about 4572.1996894274. The cubic root of 20905010 is about 275.4758043887.

Adding to 20905010 its reverse (1050902), we get a palindrome (21955912).

The spelling of 20905010 in words is "twenty million, nine hundred five thousand, ten".