20289225 has 24 divisors (see below), whose sum is σ = 36595872. Its totient is φ = 9836800.

The previous prime is 20289193. The next prime is 20289277. The reversal of 20289225 is 52298202.

It is not a de Polignac number, because 20289225 - 2⁵ = 20289193 is a prime.

It is a super-2 number, since 2×20289225² = 823305302201250, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20289192 and 20289201.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 11472 + ... + 13121.

It is an arithmetic number, because the mean of its divisors is an integer number (1524828).

Almost surely, 2^20289225 is an apocalyptic number.

20289225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20289225 is a deficient number, since it is larger than the sum of its proper divisors (16306647).

20289225 is a wasteful number, since it uses less digits than its factorization.

20289225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24617 (or 24612 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 30.

The square root of 20289225 is about 4504.3562248117. The cubic root of 20289225 is about 272.7439669074.

The spelling of 20289225 in words is "twenty million, two hundred eighty-nine thousand, two hundred twenty-five".