20533340 has 12 divisors (see below), whose sum is σ = 43120056. Its totient is φ = 8213328.

The previous prime is 20533339. The next prime is 20533361. The reversal of 20533340 is 4333502.

It is a Harshad number since it is a multiple of its sum of digits (20), and also a Moran number because the ratio is a prime number: 1026667 = 20533340 / (2 + 0 + 5 + 3 + 3 + 3 + 4 + 0).

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 3 ways as a sum of consecutive naturals, for example, 513314 + ... + 513353.

It is an arithmetic number, because the mean of its divisors is an integer number (3593338).

Almost surely, 2^20533340 is an apocalyptic number.

20533340 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20533340 is an abundant number, since it is smaller than the sum of its proper divisors (22586716).

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

20533340 is a wasteful number, since it uses less digits than its factorization.

20533340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1026676 (or 1026674 counting only the distinct ones).

The product of its (nonzero) digits is 1080, while the sum is 20.

The square root of 20533340 is about 4531.3728604033. The cubic root of 20533340 is about 273.8334719006.

Adding to 20533340 its reverse (4333502), we get a palindrome (24866842).

The spelling of 20533340 in words is "twenty million, five hundred thirty-three thousand, three hundred forty".