20124340 has 12 divisors (see below), whose sum is σ = 42261156. Its totient is φ = 8049728.

The previous prime is 20124331. The next prime is 20124353. The reversal of 20124340 is 4342102.

It can be written as a sum of positive squares in 2 ways, for example, as 7193124 + 12931216 = 2682^2 + 3596^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 503089 + ... + 503128.

It is an arithmetic number, because the mean of its divisors is an integer number (3521763).

Almost surely, 2^20124340 is an apocalyptic number.

20124340 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20124340 is an abundant number, since it is smaller than the sum of its proper divisors (22136816).

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

20124340 is a wasteful number, since it uses less digits than its factorization.

20124340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1006226 (or 1006224 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 16.

The square root of 20124340 is about 4486.0160499044. The cubic root of 20124340 is about 272.0031177555.

Adding to 20124340 its reverse (4342102), we get a palindrome (24466442).

The spelling of 20124340 in words is "twenty million, one hundred twenty-four thousand, three hundred forty".