20666652 has 24 divisors (see below), whose sum is σ = 49249536.
Its totient is φ = 6742128.
The previous prime is 20666651. The next prime is 20666669. The reversal of 20666652 is 25666602.
It is a super-2 number, since 2×206666522 = 854221009778208, which contains 22 as substring.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (20666651) 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 7 ways as a sum of consecutive naturals, for example, 17758 + ... + 18885.
It is an arithmetic number, because the mean of its divisors is an integer number (2052064).
Almost surely, 220666652 is an apocalyptic number.
It is an amenable number.
20666652 is an abundant number, since it is smaller than the sum of its proper divisors (28582884).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
20666652 is a wasteful number, since it uses less digits than its factorization.
20666652 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 36697 (or 36695 counting only the distinct ones).
The product of its (nonzero) digits is 25920, while the sum is 33.
The square root of 20666652 is about 4546.0589525434.
The cubic root of 20666652 is about 274.4248121052.
The spelling of 20666652 in words is "twenty million, six hundred sixty-six thousand, six hundred fifty-two".