20017668 has 48 divisors (see below), whose sum is σ = 51367680. Its totient is φ = 6016800.

The previous prime is 20017651. The next prime is 20017681. The reversal of 20017668 is 86671002.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17803 + ... + 18893.

It is an arithmetic number, because the mean of its divisors is an integer number (1070160).

Almost surely, 2^20017668 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 20017668, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25683840).

20017668 is an abundant number, since it is smaller than the sum of its proper divisors (31350012).

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

20017668 is a wasteful number, since it uses less digits than its factorization.

20017668 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1248 (or 1246 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 30.

The square root of 20017668 is about 4474.1108613891. The cubic root of 20017668 is about 271.5216686849.

It can be divided in two parts, 2001 and 7668, that added together give a palindrome (9669).

The spelling of 20017668 in words is "twenty million, seventeen thousand, six hundred sixty-eight".