20866680 has 96 divisors (see below), whose sum is σ = 70059600. Its totient is φ = 5524416.

The previous prime is 20866679. The next prime is 20866691. The reversal of 20866680 is 8666802.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 150051 + ... + 150189.

Almost surely, 2^20866680 is an apocalyptic number.

20866680 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20866680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35029800).

20866680 is an abundant number, since it is smaller than the sum of its proper divisors (49192920).

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

20866680 is a wasteful number, since it uses less digits than its factorization.

20866680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 298 (or 149 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 36.

The square root of 20866680 is about 4568.0061295931. The cubic root of 20866680 is about 275.3073368367.

The spelling of 20866680 in words is "twenty million, eight hundred sixty-six thousand, six hundred eighty".