16665420 has 24 divisors (see below), whose sum is σ = 46663344. Its totient is φ = 4444096.

The previous prime is 16665403. The next prime is 16665421. The reversal of 16665420 is 2456661.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is not an unprimeable number, because it can be changed into a prime (16665421) 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, 138819 + ... + 138938.

It is an arithmetic number, because the mean of its divisors is an integer number (1944306).

Almost surely, 2^16665420 is an apocalyptic number.

16665420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

16665420 is an abundant number, since it is smaller than the sum of its proper divisors (29997924).

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

16665420 is a wasteful number, since it uses less digits than its factorization.

16665420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 277769 (or 277767 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 30.

The square root of 16665420 is about 4082.3302169227. The cubic root of 16665420 is about 255.4301084229.

The spelling of 16665420 in words is "sixteen million, six hundred sixty-five thousand, four hundred twenty".