20206240 has 48 divisors (see below), whose sum is σ = 48771072. Its totient is φ = 7907584.

The previous prime is 20206223. The next prime is 20206247. The reversal of 20206240 is 4260202.

It is a Harshad number since it is a multiple of its sum of digits (16).

It is not an unprimeable number, because it can be changed into a prime (20206247) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6177 + ... + 8863.

It is an arithmetic number, because the mean of its divisors is an integer number (1016064).

Almost surely, 2^20206240 is an apocalyptic number.

20206240 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 20206240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24385536).

20206240 is an abundant number, since it is smaller than the sum of its proper divisors (28564832).

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

20206240 is a wasteful number, since it uses less digits than its factorization.

20206240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2749 (or 2741 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 16.

The square root of 20206240 is about 4495.1351481351. The cubic root of 20206240 is about 272.3716085679.

Adding to 20206240 its reverse (4260202), we get a palindrome (24466442).

The spelling of 20206240 in words is "twenty million, two hundred six thousand, two hundred forty".