20553225 has 48 divisors (see below), whose sum is σ = 42378240. Its totient is φ = 8539200.

The previous prime is 20553179. The next prime is 20553227. The reversal of 20553225 is 52235502.

It is not a de Polignac number, because 20553225 - 2¹⁷ = 20422153 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20553195 and 20553204.

It is not an unprimeable number, because it can be changed into a prime (20553227) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 3996 + ... + 7554.

It is an arithmetic number, because the mean of its divisors is an integer number (882880).

Almost surely, 2^20553225 is an apocalyptic number.

20553225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20553225 is an abundant number, since it is smaller than the sum of its proper divisors (21825015).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20553225 is a wasteful number, since it uses less digits than its factorization.

20553225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3590 (or 3585 counting only the distinct ones).

The product of its (nonzero) digits is 3000, while the sum is 24.

The square root of 20553225 is about 4533.5664768480. The cubic root of 20553225 is about 273.9218391087.

Adding to 20553225 its reverse (52235502), we get a palindrome (72788727).

The spelling of 20553225 in words is "twenty million, five hundred fifty-three thousand, two hundred twenty-five".