20510812 has 36 divisors (see below), whose sum is σ = 42029064. Its totient is φ = 8732640.

The previous prime is 20510797. The next prime is 20510821. The reversal of 20510812 is 21801502.

It is a self number, because there is not a number n which added to its sum of digits gives 20510812.

It is a congruent number.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 44262 + ... + 44722.

It is an arithmetic number, because the mean of its divisors is an integer number (1167474).

Almost surely, 2^20510812 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20510812, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21014532).

20510812 is an abundant number, since it is smaller than the sum of its proper divisors (21518252).

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

20510812 is a wasteful number, since it uses less digits than its factorization.

20510812 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 706 (or 697 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 19.

The square root of 20510812 is about 4528.8863973388. The cubic root of 20510812 is about 273.7332904739.

It can be divided in two parts, 205108 and 12, that added together give a triangular number (205120 = T₆₄₀).

The spelling of 20510812 in words is "twenty million, five hundred ten thousand, eight hundred twelve".