16820625 has 20 divisors (see below), whose sum is σ = 28028528. Its totient is φ = 8970000.

The previous prime is 16820603. The next prime is 16820647. The reversal of 16820625 is 52602861.

It is an interprime number because it is at equal distance from previous prime (16820603) and next prime (16820647).

It is not a de Polignac number, because 16820625 - 2⁶ = 16820561 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 16820592 and 16820601.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 2611 + ... + 6360.

Almost surely, 2^16820625 is an apocalyptic number.

16820625 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

16820625 is a deficient number, since it is larger than the sum of its proper divisors (11207903).

16820625 is an frugal number, since it uses more digits than its factorization.

16820625 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8994 (or 8979 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 30.

The square root of 16820625 is about 4101.2955270256. The cubic root of 16820625 is about 256.2205994427.

The spelling of 16820625 in words is "sixteen million, eight hundred twenty thousand, six hundred twenty-five".