20120140 has 12 divisors (see below), whose sum is σ = 42252336. Its totient is φ = 8048048.

The previous prime is 20120081. The next prime is 20120143. The reversal of 20120140 is 4102102.

It is a Harshad number since it is a multiple of its sum of digits (10).

It is not an unprimeable number, because it can be changed into a prime (20120143) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 502984 + ... + 503023.

It is an arithmetic number, because the mean of its divisors is an integer number (3521028).

Almost surely, 2^20120140 is an apocalyptic number.

20120140 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20120140 is an abundant number, since it is smaller than the sum of its proper divisors (22132196).

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

20120140 is a wasteful number, since it uses less digits than its factorization.

20120140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1006016 (or 1006014 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 10.

The square root of 20120140 is about 4485.5479041027. The cubic root of 20120140 is about 271.9841938624.

Adding to 20120140 its reverse (4102102), we get a palindrome (24222242).

The spelling of 20120140 in words is "twenty million, one hundred twenty thousand, one hundred forty".