20853601 has 2 divisors, whose sum is σ = 20853602. Its totient is φ = 20853600.

The previous prime is 20853587. The next prime is 20853619. The reversal of 20853601 is 10635802.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20034576 + 819025 = 4476^2 + 905^2 .

It is a cyclic number.

It is not a de Polignac number, because 20853601 - 2⁷ = 20853473 is a prime.

It is equal to p_1321288 and since 20853601 and 1321288 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (20853641) 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 as a sum of consecutive naturals, namely, 10426800 + 10426801.

It is an arithmetic number, because the mean of its divisors is an integer number (10426801).

Almost surely, 2^20853601 is an apocalyptic number.

It is an amenable number.

20853601 is a deficient number, since it is larger than the sum of its proper divisors (1).

20853601 is an equidigital number, since it uses as much as digits as its factorization.

20853601 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1440, while the sum is 25.

The square root of 20853601 is about 4566.5743178010. The cubic root of 20853601 is about 275.2498049689.

The spelling of 20853601 in words is "twenty million, eight hundred fifty-three thousand, six hundred one".