20206340 has 48 divisors (see below), whose sum is σ = 52907904. Its totient is φ = 6297600.

The previous prime is 20206331. The next prime is 20206343. The reversal of 20206340 is 4360202.

It is not an unprimeable number, because it can be changed into a prime (20206343) 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, 5021 + ... + 8100.

It is an arithmetic number, because the mean of its divisors is an integer number (1102248).

Almost surely, 2^20206340 is an apocalyptic number.

20206340 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20206340 is an abundant number, since it is smaller than the sum of its proper divisors (32701564).

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

20206340 is a wasteful number, since it uses less digits than its factorization.

20206340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13148 (or 13146 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 17.

The square root of 20206340 is about 4495.1462712575. The cubic root of 20206340 is about 272.3720578864.

Adding to 20206340 its reverse (4360202), we get a palindrome (24566542).

The spelling of 20206340 in words is "twenty million, two hundred six thousand, three hundred forty".