20744225 has 12 divisors (see below), whose sum is σ = 25784064. Its totient is φ = 16555920.

The previous prime is 20744173. The next prime is 20744231. The reversal of 20744225 is 52244702.

It is not a de Polignac number, because 20744225 - 2²⁰ = 19695649 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20744194 and 20744203.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 14492 + ... + 15858.

It is an arithmetic number, because the mean of its divisors is an integer number (2148672).

Almost surely, 2^20744225 is an apocalyptic number.

20744225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20744225 is a deficient number, since it is larger than the sum of its proper divisors (5039839).

20744225 is a wasteful number, since it uses less digits than its factorization.

20744225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1984 (or 1979 counting only the distinct ones).

The product of its (nonzero) digits is 4480, while the sum is 26.

The square root of 20744225 is about 4554.5828568597. The cubic root of 20744225 is about 274.7677377732.

Adding to 20744225 its reverse (52244702), we get a palindrome (72988927).

The spelling of 20744225 in words is "twenty million, seven hundred forty-four thousand, two hundred twenty-five".