20443340 has 12 divisors (see below), whose sum is σ = 42931056. Its totient is φ = 8177328.

The previous prime is 20443331. The next prime is 20443363. The reversal of 20443340 is 4334402.

It is a happy number.

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: 1022167 = 20443340 / (2 + 0 + 4 + 4 + 3 + 3 + 4 + 0).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 511064 + ... + 511103.

It is an arithmetic number, because the mean of its divisors is an integer number (3577588).

Almost surely, 2^20443340 is an apocalyptic number.

20443340 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20443340 is an abundant number, since it is smaller than the sum of its proper divisors (22487716).

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

20443340 is a wasteful number, since it uses less digits than its factorization.

20443340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1022176 (or 1022174 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 20.

The square root of 20443340 is about 4521.4311893470. The cubic root of 20443340 is about 273.4328046976.

Adding to 20443340 its reverse (4334402), we get a palindrome (24777742).

The spelling of 20443340 in words is "twenty million, four hundred forty-three thousand, three hundred forty".