20667660 has 48 divisors (see below), whose sum is σ = 62323296. Its totient is φ = 5087232.

The previous prime is 20667659. The next prime is 20667677. The reversal of 20667660 is 6676602.

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 15 ways as a sum of consecutive naturals, for example, 12469 + ... + 14028.

It is an arithmetic number, because the mean of its divisors is an integer number (1298402).

Almost surely, 2^20667660 is an apocalyptic number.

20667660 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20667660 is an abundant number, since it is smaller than the sum of its proper divisors (41655636).

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

20667660 is a wasteful number, since it uses less digits than its factorization.

20667660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26522 (or 26520 counting only the distinct ones).

The product of its (nonzero) digits is 18144, while the sum is 33.

The square root of 20667660 is about 4546.1698164499. The cubic root of 20667660 is about 274.4292736522.

The spelling of 20667660 in words is "twenty million, six hundred sixty-seven thousand, six hundred sixty".