20012140 has 24 divisors (see below), whose sum is σ = 42445872. Its totient is φ = 7924800.

The previous prime is 20012119. The next prime is 20012171. The reversal of 20012140 is 4121002.

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

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, 2934 + ... + 6973.

It is an arithmetic number, because the mean of its divisors is an integer number (1768578).

Almost surely, 2^20012140 is an apocalyptic number.

20012140 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20012140 is an abundant number, since it is smaller than the sum of its proper divisors (22433732).

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

20012140 is a wasteful number, since it uses less digits than its factorization.

20012140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10017 (or 10015 counting only the distinct ones).

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

The square root of 20012140 is about 4473.4930423552. The cubic root of 20012140 is about 271.4966722672.

Adding to 20012140 its reverse (4121002), we get a palindrome (24133142).

The spelling of 20012140 in words is "twenty million, twelve thousand, one hundred forty".