20745225 has 36 divisors (see below), whose sum is σ = 37483836. Its totient is φ = 10967040.

The previous prime is 20745217. The next prime is 20745233. The reversal of 20745225 is 52254702.

20745225 is a `hidden beast` number, since 207 + 452 + 2 + 5 = 666.

It is an interprime number because it is at equal distance from previous prime (20745217) and next prime (20745233).

It can be written as a sum of positive squares in 6 ways, for example, as 710649 + 20034576 = 843^2 + 4476^2 .

It is not a de Polignac number, because 20745225 - 2³ = 20745217 is a prime.

It is a zygodrome in base 3.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 30489 + ... + 31161.

Almost surely, 2^20745225 is an apocalyptic number.

20745225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20745225 is a deficient number, since it is larger than the sum of its proper divisors (16738611).

20745225 is a wasteful number, since it uses less digits than its factorization.

20745225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 826 (or 818 counting only the distinct ones).

The product of its (nonzero) digits is 5600, while the sum is 27.

The square root of 20745225 is about 4554.6926350743. The cubic root of 20745225 is about 274.7721528706.

Adding to 20745225 its reverse (52254702), we get a palindrome (72999927).

The spelling of 20745225 in words is "twenty million, seven hundred forty-five thousand, two hundred twenty-five".