20430340 has 24 divisors (see below), whose sum is σ = 49033152. Its totient is φ = 7004640.

The previous prime is 20430323. The next prime is 20430349. The reversal of 20430340 is 4303402.

It is not an unprimeable number, because it can be changed into a prime (20430349) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 72826 + ... + 73105.

It is an arithmetic number, because the mean of its divisors is an integer number (2043048).

Almost surely, 2^20430340 is an apocalyptic number.

20430340 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20430340 is an abundant number, since it is smaller than the sum of its proper divisors (28602812).

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

20430340 is a wasteful number, since it uses less digits than its factorization.

20430340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 145947 (or 145945 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 16.

The square root of 20430340 is about 4519.9933628270. The cubic root of 20430340 is about 273.3748334106.

Adding to 20430340 its reverse (4303402), we get a palindrome (24733742).

The spelling of 20430340 in words is "twenty million, four hundred thirty thousand, three hundred forty".