20768225 has 6 divisors (see below), whose sum is σ = 25752630. Its totient is φ = 16614560.

The previous prime is 20768207. The next prime is 20768249. The reversal of 20768225 is 52286702.

It can be written as a sum of positive squares in 3 ways, for example, as 38416 + 20729809 = 196^2 + 4553^2 .

It is not a de Polignac number, because 20768225 - 2¹⁸ = 20506081 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20768191 and 20768200.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 415340 + ... + 415389.

It is an arithmetic number, because the mean of its divisors is an integer number (4292105).

Almost surely, 2^20768225 is an apocalyptic number.

20768225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20768225 is a deficient number, since it is larger than the sum of its proper divisors (4984405).

20768225 is an equidigital number, since it uses as much as digits as its factorization.

20768225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 830739 (or 830734 counting only the distinct ones).

The product of its (nonzero) digits is 13440, while the sum is 32.

The square root of 20768225 is about 4557.2168041470. The cubic root of 20768225 is about 274.8736609752.

It can be divided in two parts, 2076 and 8225, that added together give a palindrome (10301).

The spelling of 20768225 in words is "twenty million, seven hundred sixty-eight thousand, two hundred twenty-five".