20988860 has 48 divisors (see below), whose sum is σ = 46099200. Its totient is φ = 8017920.

The previous prime is 20988853. The next prime is 20988881. The reversal of 20988860 is 6888902.

It is a happy number.

It is a congruent 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, 59966 + ... + 60314.

It is an arithmetic number, because the mean of its divisors is an integer number (960400).

Almost surely, 2^20988860 is an apocalyptic number.

20988860 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 20988860, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23049600).

20988860 is an abundant number, since it is smaller than the sum of its proper divisors (25110340).

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

20988860 is a wasteful number, since it uses less digits than its factorization.

20988860 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 486 (or 484 counting only the distinct ones).

The product of its (nonzero) digits is 55296, while the sum is 41.

The square root of 20988860 is about 4581.3600600695. The cubic root of 20988860 is about 275.8436242229.

The spelling of 20988860 in words is "twenty million, nine hundred eighty-eight thousand, eight hundred sixty".