20524385 has 12 divisors (see below), whose sum is σ = 28650708. Its totient is φ = 14073696.

The previous prime is 20524367. The next prime is 20524403. The reversal of 20524385 is 58342502.

It is an interprime number because it is at equal distance from previous prime (20524367) and next prime (20524403).

It can be written as a sum of positive squares in 2 ways, for example, as 7879249 + 12645136 = 2807^2 + 3556^2 .

It is not a de Polignac number, because 20524385 - 2⁸ = 20524129 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 41642 + ... + 42131.

It is an arithmetic number, because the mean of its divisors is an integer number (2387559).

Almost surely, 2^20524385 is an apocalyptic number.

It is an amenable number.

20524385 is a deficient number, since it is larger than the sum of its proper divisors (8126323).

20524385 is an equidigital number, since it uses as much as digits as its factorization.

20524385 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83792 (or 83785 counting only the distinct ones).

The product of its (nonzero) digits is 9600, while the sum is 29.

The square root of 20524385 is about 4530.3846415067. The cubic root of 20524385 is about 273.7936580287.

Adding to 20524385 its reverse (58342502), we get a palindrome (78866887).

The spelling of 20524385 in words is "twenty million, five hundred twenty-four thousand, three hundred eighty-five".