16420625 has 40 divisors (see below), whose sum is σ = 23092608. Its totient is φ = 11592000.

The previous prime is 16420601. The next prime is 16420661. The reversal of 16420625 is 52602461.

It is not a de Polignac number, because 16420625 - 2²² = 12226321 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 16420594 and 16420603.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 349352 + ... + 349398.

Almost surely, 2^16420625 is an apocalyptic number.

It is an amenable number.

16420625 is a deficient number, since it is larger than the sum of its proper divisors (6671983).

16420625 is an equidigital number, since it uses as much as digits as its factorization.

16420625 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 123 (or 108 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 26.

The square root of 16420625 is about 4052.2370365022. The cubic root of 16420625 is about 254.1732806067.

The spelling of 16420625 in words is "sixteen million, four hundred twenty thousand, six hundred twenty-five".