20343140 has 12 divisors (see below), whose sum is σ = 42720636. Its totient is φ = 8137248.

The previous prime is 20343139. The next prime is 20343179. The reversal of 20343140 is 4134302.

It can be written as a sum of positive squares in 2 ways, for example, as 10445824 + 9897316 = 3232^2 + 3146^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 508559 + ... + 508598.

It is an arithmetic number, because the mean of its divisors is an integer number (3560053).

Almost surely, 2^20343140 is an apocalyptic number.

20343140 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20343140 is an abundant number, since it is smaller than the sum of its proper divisors (22377496).

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

20343140 is a wasteful number, since it uses less digits than its factorization.

20343140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1017166 (or 1017164 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 17.

The square root of 20343140 is about 4510.3370162328. The cubic root of 20343140 is about 272.9853427259.

Adding to 20343140 its reverse (4134302), we get a palindrome (24477442).

The spelling of 20343140 in words is "twenty million, three hundred forty-three thousand, one hundred forty".