20320140 has 24 divisors (see below), whose sum is σ = 56896560. Its totient is φ = 5418688.

The previous prime is 20320103. The next prime is 20320171. The reversal of 20320140 is 4102302.

It is a Harshad number since it is a multiple of its sum of digits (12).

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, 169275 + ... + 169394.

It is an arithmetic number, because the mean of its divisors is an integer number (2370690).

Almost surely, 2^20320140 is an apocalyptic number.

20320140 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20320140 is an abundant number, since it is smaller than the sum of its proper divisors (36576420).

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

20320140 is a wasteful number, since it uses less digits than its factorization.

20320140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 338681 (or 338679 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 12.

The square root of 20320140 is about 4507.7865965460. The cubic root of 20320140 is about 272.8824246481.

Adding to 20320140 its reverse (4102302), we get a palindrome (24422442).

The spelling of 20320140 in words is "twenty million, three hundred twenty thousand, one hundred forty".