20608440 has 64 divisors (see below), whose sum is σ = 62208000. Its totient is φ = 5461632.

The previous prime is 20608439. The next prime is 20608453. The reversal of 20608440 is 4480602.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 20608440.

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, 23449 + ... + 24311.

It is an arithmetic number, because the mean of its divisors is an integer number (972000).

Almost surely, 2^20608440 is an apocalyptic number.

20608440 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 20608440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31104000).

20608440 is an abundant number, since it is smaller than the sum of its proper divisors (41599560).

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

20608440 is a wasteful number, since it uses less digits than its factorization.

20608440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1076 (or 1072 counting only the distinct ones).

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

The square root of 20608440 is about 4539.6519690390. The cubic root of 20608440 is about 274.1669112852.

The spelling of 20608440 in words is "twenty million, six hundred eight thousand, four hundred forty".