20783225 has 6 divisors (see below), whose sum is σ = 25771230. Its totient is φ = 16626560.

The previous prime is 20783221. The next prime is 20783239. The reversal of 20783225 is 52238702.

It can be written as a sum of positive squares in 3 ways, for example, as 1449616 + 19333609 = 1204^2 + 4397^2 .

It is not a de Polignac number, because 20783225 - 2² = 20783221 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20783221) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 415640 + ... + 415689.

It is an arithmetic number, because the mean of its divisors is an integer number (4295205).

Almost surely, 2^20783225 is an apocalyptic number.

20783225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20783225 is a deficient number, since it is larger than the sum of its proper divisors (4988005).

20783225 is an equidigital number, since it uses as much as digits as its factorization.

20783225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 831339 (or 831334 counting only the distinct ones).

The product of its (nonzero) digits is 6720, while the sum is 29.

The square root of 20783225 is about 4558.8622484124. The cubic root of 20783225 is about 274.9398215428.

The spelling of 20783225 in words is "twenty million, seven hundred eighty-three thousand, two hundred twenty-five".