12660420 has 24 divisors (see below), whose sum is σ = 35449344. Its totient is φ = 3376096.

The previous prime is 12660413. The next prime is 12660421. The reversal of 12660420 is 2406621.

12660420 = T₆₄ + T₆₅ + ... + T₄₂₃.

It is a happy number.

It is a hoax number, since the sum of its digits (21) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (12660421) 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, 105444 + ... + 105563.

It is an arithmetic number, because the mean of its divisors is an integer number (1477056).

Almost surely, 2^12660420 is an apocalyptic number.

12660420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12660420 is an abundant number, since it is smaller than the sum of its proper divisors (22788924).

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

12660420 is a wasteful number, since it uses less digits than its factorization.

12660420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 211019 (or 211017 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 21.

The square root of 12660420 is about 3558.1483948818. The cubic root of 12660420 is about 233.0680295253.

The spelling of 12660420 in words is "twelve million, six hundred sixty thousand, four hundred twenty".