20439340 has 24 divisors (see below), whose sum is σ = 43020432. Its totient is φ = 8157120.

The previous prime is 20439329. The next prime is 20439347. The reversal of 20439340 is 4393402.

It is not an unprimeable number, because it can be changed into a prime (20439347) 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, 10870 + ... + 12610.

It is an arithmetic number, because the mean of its divisors is an integer number (1792518).

Almost surely, 2^20439340 is an apocalyptic number.

20439340 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20439340 is an abundant number, since it is smaller than the sum of its proper divisors (22581092).

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

20439340 is a wasteful number, since it uses less digits than its factorization.

20439340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2337 (or 2335 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 25.

The square root of 20439340 is about 4520.9888298911. The cubic root of 20439340 is about 273.4149699967.

The spelling of 20439340 in words is "twenty million, four hundred thirty-nine thousand, three hundred forty".