20601440 has 48 divisors (see below), whose sum is σ = 48943440. Its totient is φ = 8194560.

The previous prime is 20601439. The next prime is 20601473. The reversal of 20601440 is 4410602.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 52766 + ... + 53154.

It is an arithmetic number, because the mean of its divisors is an integer number (1019655).

Almost surely, 2^20601440 is an apocalyptic number.

20601440 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 20601440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24471720).

20601440 is an abundant number, since it is smaller than the sum of its proper divisors (28342000).

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

20601440 is a wasteful number, since it uses less digits than its factorization.

20601440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 735 (or 727 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 17.

The square root of 20601440 is about 4538.8809193456. The cubic root of 20601440 is about 274.1358659835.

The spelling of 20601440 in words is "twenty million, six hundred one thousand, four hundred forty".