16626420 has 36 divisors (see below), whose sum is σ = 50434020. Its totient is φ = 4433664.

The previous prime is 16626403. The next prime is 16626427. The reversal of 16626420 is 2462661.

It is a happy number.

16626420 is a `hidden beast` number, since 16 + 6 + 2 + 642 + 0 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 8088336 + 8538084 = 2844^2 + 2922^2 .

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16626427) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 46005 + ... + 46364.

It is an arithmetic number, because the mean of its divisors is an integer number (1400945).

Almost surely, 2^16626420 is an apocalyptic number.

16626420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

16626420 is an abundant number, since it is smaller than the sum of its proper divisors (33807600).

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

16626420 is a wasteful number, since it uses less digits than its factorization.

16626420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 92384 (or 92379 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 27.

The square root of 16626420 is about 4077.5507354293. The cubic root of 16626420 is about 255.2307024051.

The spelling of 16626420 in words is "sixteen million, six hundred twenty-six thousand, four hundred twenty".