20340440 has 32 divisors (see below), whose sum is σ = 46219680. Its totient is φ = 8055552.

The previous prime is 20340413. The next prime is 20340443. The reversal of 20340440 is 4404302.

20340440 = 1120² + 1121² + ... + 1135².

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20340443) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1652 + ... + 6588.

It is an arithmetic number, because the mean of its divisors is an integer number (1444365).

Almost surely, 2^20340440 is an apocalyptic number.

20340440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20340440 is an abundant number, since it is smaller than the sum of its proper divisors (25879240).

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

20340440 is a wasteful number, since it uses less digits than its factorization.

20340440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5051 (or 5047 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 17.

The square root of 20340440 is about 4510.0376938558. The cubic root of 20340440 is about 272.9732650585.

Adding to 20340440 its reverse (4404302), we get a palindrome (24744742).

The spelling of 20340440 in words is "twenty million, three hundred forty thousand, four hundred forty".