20404860 has 96 divisors (see below), whose sum is σ = 68759040. Its totient is φ = 4416768.

The previous prime is 20404847. The next prime is 20404883. The reversal of 20404860 is 6840402.

It is a self number, because there is not a number n which added to its sum of digits gives 20404860.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 6702 + ... + 9258.

It is an arithmetic number, because the mean of its divisors is an integer number (716240).

Almost surely, 2^20404860 is an apocalyptic number.

20404860 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 20404860, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34379520).

20404860 is an abundant number, since it is smaller than the sum of its proper divisors (48354180).

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

20404860 is a wasteful number, since it uses less digits than its factorization.

20404860 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2595 (or 2593 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 24.

The square root of 20404860 is about 4517.1738952580. The cubic root of 20404860 is about 273.2611383128.

The spelling of 20404860 in words is "twenty million, four hundred four thousand, eight hundred sixty".