20001853 has 2 divisors, whose sum is σ = 20001854. Its totient is φ = 20001852.

The previous prime is 20001847. The next prime is 20001899. The reversal of 20001853 is 35810002.

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., 13741849 + 6260004 = 3707^2 + 2502^2 .

It is a cyclic number.

It is not a de Polignac number, because 20001853 - 2⁹ = 20001341 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20001853.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20001823) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10000926 + 10000927.

It is an arithmetic number, because the mean of its divisors is an integer number (10000927).

Almost surely, 2^20001853 is an apocalyptic number.

It is an amenable number.

20001853 is a deficient number, since it is larger than the sum of its proper divisors (1).

20001853 is an equidigital number, since it uses as much as digits as its factorization.

20001853 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 240, while the sum is 19.

The square root of 20001853 is about 4472.3431218993. The cubic root of 20001853 is about 271.4501444270.

Adding to 20001853 its reverse (35810002), we get a palindrome (55811855).

The spelling of 20001853 in words is "twenty million, one thousand, eight hundred fifty-three".