12090420 has 36 divisors (see below), whose sum is σ = 36674820. Its totient is φ = 3224064.

The previous prime is 12090409. The next prime is 12090431. The reversal of 12090420 is 2409021.

12090420 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (12090409) and next prime (12090431).

It can be written as a sum of positive squares in 2 ways, for example, as 3305124 + 8785296 = 1818^2 + 2964^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 12090393 and 12090402.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 33405 + ... + 33764.

It is an arithmetic number, because the mean of its divisors is an integer number (1018745).

Almost surely, 2^12090420 is an apocalyptic number.

12090420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12090420 is an abundant number, since it is smaller than the sum of its proper divisors (24584400).

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

12090420 is a wasteful number, since it uses less digits than its factorization.

12090420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67184 (or 67179 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

The square root of 12090420 is about 3477.1281253356. The cubic root of 12090420 is about 229.5164383686.

Adding to 12090420 its reverse (2409021), we get a palindrome (14499441).

The spelling of 12090420 in words is "twelve million, ninety thousand, four hundred twenty".