20342440 has 32 divisors (see below), whose sum is σ = 46838880. Its totient is φ = 7947072.

The previous prime is 20342431. The next prime is 20342447. The reversal of 20342440 is 4424302.

It is not an unprimeable number, because it can be changed into a prime (20342447) 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, 4194 + ... + 7633.

It is an arithmetic number, because the mean of its divisors is an integer number (1463715).

Almost surely, 2^20342440 is an apocalyptic number.

20342440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20342440 is an abundant number, since it is smaller than the sum of its proper divisors (26496440).

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

20342440 is a wasteful number, since it uses less digits than its factorization.

20342440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11881 (or 11877 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 19.

The square root of 20342440 is about 4510.2594160425. The cubic root of 20342440 is about 272.9822115814.

Adding to 20342440 its reverse (4424302), we get a palindrome (24766742).

The spelling of 20342440 in words is "twenty million, three hundred forty-two thousand, four hundred forty".