16620425 has 12 divisors (see below), whose sum is σ = 20688780. Its totient is φ = 13245120.

The previous prime is 16620391. The next prime is 16620431. The reversal of 16620425 is 52402661.

It can be written as a sum of positive squares in 6 ways, for example, as 395641 + 16224784 = 629^2 + 4028^2 .

It is not a de Polignac number, because 16620425 - 2⁶ = 16620361 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 16620394 and 16620403.

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, 6191 + ... + 8459.

It is an arithmetic number, because the mean of its divisors is an integer number (1724065).

Almost surely, 2^16620425 is an apocalyptic number.

It is an amenable number.

16620425 is a deficient number, since it is larger than the sum of its proper divisors (4068355).

16620425 is a wasteful number, since it uses less digits than its factorization.

16620425 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2572 (or 2567 counting only the distinct ones).

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

The square root of 16620425 is about 4076.8155464774. The cubic root of 16620425 is about 255.2000224791.

The spelling of 16620425 in words is "sixteen million, six hundred twenty thousand, four hundred twenty-five".