20867225 has 24 divisors (see below), whose sum is σ = 27498240. Its totient is φ = 15664320.

The previous prime is 20867221. The next prime is 20867251. The reversal of 20867225 is 52276802.

It is not a de Polignac number, because 20867225 - 2² = 20867221 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20867191 and 20867200.

It is not an unprimeable number, because it can be changed into a prime (20867221) by changing a digit.

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, 93464 + ... + 93686.

It is an arithmetic number, because the mean of its divisors is an integer number (1145760).

Almost surely, 2^20867225 is an apocalyptic number.

20867225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20867225 is a deficient number, since it is larger than the sum of its proper divisors (6631015).

20867225 is a wasteful number, since it uses less digits than its factorization.

20867225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 449 (or 444 counting only the distinct ones).

The product of its (nonzero) digits is 13440, while the sum is 32.

The square root of 20867225 is about 4568.0657832391. The cubic root of 20867225 is about 275.3097336593.

The spelling of 20867225 in words is "twenty million, eight hundred sixty-seven thousand, two hundred twenty-five".