20386240 has 112 divisors (see below), whose sum is σ = 58521600. Its totient is φ = 6607872.

The previous prime is 20386237. The next prime is 20386241. The reversal of 20386240 is 4268302.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (112).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20386241) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 42321 + ... + 42799.

Almost surely, 2^20386240 is an apocalyptic number.

20386240 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 20386240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29260800).

20386240 is an abundant number, since it is smaller than the sum of its proper divisors (38135360).

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

20386240 is a wasteful number, since it uses less digits than its factorization.

20386240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 522 (or 512 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 25.

The square root of 20386240 is about 4515.1124017016. The cubic root of 20386240 is about 273.1779935642.

The spelling of 20386240 in words is "twenty million, three hundred eighty-six thousand, two hundred forty".