20637666 has 40 divisors (see below), whose sum is σ = 52852800. Its totient is φ = 5896152.

The previous prime is 20637619. The next prime is 20637679. The reversal of 20637666 is 66673602.

It is a self number, because there is not a number n which added to its sum of digits gives 20637666.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 7966 + ... + 10233.

It is an arithmetic number, because the mean of its divisors is an integer number (1321320).

Almost surely, 2^20637666 is an apocalyptic number.

20637666 is an abundant number, since it is smaller than the sum of its proper divisors (32215134).

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

20637666 is a wasteful number, since it uses less digits than its factorization.

20637666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18220 (or 18211 counting only the distinct ones).

The product of its (nonzero) digits is 54432, while the sum is 36.

The square root of 20637666 is about 4542.8697978260. The cubic root of 20637666 is about 274.2964539601.

The spelling of 20637666 in words is "twenty million, six hundred thirty-seven thousand, six hundred sixty-six".