20831140 has 24 divisors (see below), whose sum is σ = 47722752. Its totient is φ = 7574880.

The previous prime is 20831131. The next prime is 20831141. The reversal of 20831140 is 4113802.

It is not an unprimeable number, because it can be changed into a prime (20831141) 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, 47124 + ... + 47563.

It is an arithmetic number, because the mean of its divisors is an integer number (1988448).

Almost surely, 2^20831140 is an apocalyptic number.

20831140 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20831140 is an abundant number, since it is smaller than the sum of its proper divisors (26891612).

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

20831140 is a wasteful number, since it uses less digits than its factorization.

20831140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 94707 (or 94705 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 19.

The square root of 20831140 is about 4564.1143719236. The cubic root of 20831140 is about 275.1509474329.

Adding to 20831140 its reverse (4113802), we get a palindrome (24944942).

It can be divided in two parts, 2083 and 1140, that added together give a palindrome (3223).

The spelling of 20831140 in words is "twenty million, eight hundred thirty-one thousand, one hundred forty".