20416625 has 16 divisors (see below), whose sum is σ = 25625808. Its totient is φ = 16240000.

The previous prime is 20416603. The next prime is 20416661. The reversal of 20416625 is 52661402.

It can be written as a sum of positive squares in 8 ways, for example, as 5793649 + 14622976 = 2407^2 + 3824^2 .

It is not a de Polignac number, because 20416625 - 2²² = 16222321 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20416594 and 20416603.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 28775 + ... + 29475.

It is an arithmetic number, because the mean of its divisors is an integer number (1601613).

Almost surely, 2^20416625 is an apocalyptic number.

20416625 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20416625 is a deficient number, since it is larger than the sum of its proper divisors (5209183).

20416625 is an equidigital number, since it uses as much as digits as its factorization.

20416625 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 949 (or 939 counting only the distinct ones).

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

The square root of 20416625 is about 4518.4759598785. The cubic root of 20416625 is about 273.3136470388.

The spelling of 20416625 in words is "twenty million, four hundred sixteen thousand, six hundred twenty-five".