20436225 has 24 divisors (see below), whose sum is σ = 33917472. Its totient is φ = 10857600.

The previous prime is 20436209. The next prime is 20436233. The reversal of 20436225 is 52263402.

It is not a de Polignac number, because 20436225 - 2⁴ = 20436209 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 20436195 and 20436204.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 38814 + ... + 39336.

It is an arithmetic number, because the mean of its divisors is an integer number (1413228).

Almost surely, 2^20436225 is an apocalyptic number.

20436225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20436225 is a deficient number, since it is larger than the sum of its proper divisors (13481247).

20436225 is a wasteful number, since it uses less digits than its factorization.

20436225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1057 (or 1052 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 24.

The square root of 20436225 is about 4520.6443124847. The cubic root of 20436225 is about 273.4010796118.

Adding to 20436225 its reverse (52263402), we get a palindrome (72699627).

The spelling of 20436225 in words is "twenty million, four hundred thirty-six thousand, two hundred twenty-five".