20646126 has 48 divisors (see below), whose sum is σ = 47876400. Its totient is φ = 6407424.

The previous prime is 20646107. The next prime is 20646137. The reversal of 20646126 is 62164602.

It is a happy number.

20646126 is a `hidden beast` number, since 2 + 0 + 646 + 12 + 6 = 666.

20646126 is nontrivially palindromic in base 12.

It is a super-3 number, since 3×20646126³ (a number of 23 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 20646126.

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 23 ways as a sum of consecutive naturals, for example, 33045 + ... + 33663.

It is an arithmetic number, because the mean of its divisors is an integer number (997425).

Almost surely, 2^20646126 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20646126, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23938200).

20646126 is an abundant number, since it is smaller than the sum of its proper divisors (27230274).

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

20646126 is a wasteful number, since it uses less digits than its factorization.

20646126 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 753 (or 750 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 27.

The square root of 20646126 is about 4543.8008319027. The cubic root of 20646126 is about 274.3339296285. Note that the first 3 decimals are identical.

The spelling of 20646126 in words is "twenty million, six hundred forty-six thousand, one hundred twenty-six".