20153825 has 6 divisors (see below), whose sum is σ = 24990774. Its totient is φ = 16123040.

The previous prime is 20153821. The next prime is 20153839. The reversal of 20153825 is 52835102.

It can be written as a sum of positive squares in 3 ways, for example, as 2704 + 20151121 = 52^2 + 4489^2 .

It is not a de Polignac number, because 20153825 - 2² = 20153821 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20153794 and 20153803.

It is not an unprimeable number, because it can be changed into a prime (20153821) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 403052 + ... + 403101.

It is an arithmetic number, because the mean of its divisors is an integer number (4165129).

Almost surely, 2^20153825 is an apocalyptic number.

20153825 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20153825 is a deficient number, since it is larger than the sum of its proper divisors (4836949).

20153825 is an equidigital number, since it uses as much as digits as its factorization.

20153825 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 806163 (or 806158 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 26.

The square root of 20153825 is about 4489.3011705610. The cubic root of 20153825 is about 272.1358939243.

Adding to 20153825 its reverse (52835102), we get a palindrome (72988927).

The spelling of 20153825 in words is "twenty million, one hundred fifty-three thousand, eight hundred twenty-five".