20870225 has 6 divisors (see below), whose sum is σ = 25879110. Its totient is φ = 16696160.

The previous prime is 20870219. The next prime is 20870231. The reversal of 20870225 is 52207802.

It is an interprime number because it is at equal distance from previous prime (20870219) and next prime (20870231).

It can be written as a sum of positive squares in 3 ways, for example, as 719104 + 20151121 = 848^2 + 4489^2 .

It is not a de Polignac number, because 20870225 - 2²⁰ = 19821649 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20870194 and 20870203.

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 5 ways as a sum of consecutive naturals, for example, 417380 + ... + 417429.

It is an arithmetic number, because the mean of its divisors is an integer number (4313185).

Almost surely, 2^20870225 is an apocalyptic number.

20870225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20870225 is a deficient number, since it is larger than the sum of its proper divisors (5008885).

20870225 is an equidigital number, since it uses as much as digits as its factorization.

20870225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 834819 (or 834814 counting only the distinct ones).

The product of its (nonzero) digits is 2240, while the sum is 26.

The square root of 20870225 is about 4568.3941379877. The cubic root of 20870225 is about 275.3229264313.

The spelling of 20870225 in words is "twenty million, eight hundred seventy thousand, two hundred twenty-five".