20345140 has 24 divisors (see below), whose sum is σ = 42971040. Its totient is φ = 8091168.

The previous prime is 20345093. The next prime is 20345161. The reversal of 20345140 is 4154302.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 739 + ... + 6421.

It is an arithmetic number, because the mean of its divisors is an integer number (1790460).

Almost surely, 2^20345140 is an apocalyptic number.

20345140 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20345140 is an abundant number, since it is smaller than the sum of its proper divisors (22625900).

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

20345140 is a wasteful number, since it uses less digits than its factorization.

20345140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5871 (or 5869 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 19.

The square root of 20345140 is about 4510.5587237060. The cubic root of 20345140 is about 272.9942884572.

Adding to 20345140 its reverse (4154302), we get a palindrome (24499442).

The spelling of 20345140 in words is "twenty million, three hundred forty-five thousand, one hundred forty".