20111953 has 4 divisors (see below), whose sum is σ = 20338020. Its totient is φ = 19885888.

The previous prime is 20111947. The next prime is 20111981. The reversal of 20111953 is 35911102.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 9659664 + 10452289 = 3108^2 + 3233^2 .

It is a cyclic number.

It is not a de Polignac number, because 20111953 - 2¹³ = 20103761 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20111933) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 112900 + ... + 113077.

It is an arithmetic number, because the mean of its divisors is an integer number (5084505).

Almost surely, 2^20111953 is an apocalyptic number.

It is an amenable number.

20111953 is a deficient number, since it is larger than the sum of its proper divisors (226067).

20111953 is an equidigital number, since it uses as much as digits as its factorization.

20111953 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 226066.

The product of its (nonzero) digits is 270, while the sum is 22.

The square root of 20111953 is about 4484.6352137047. The cubic root of 20111953 is about 271.9472982164.

The spelling of 20111953 in words is "twenty million, one hundred eleven thousand, nine hundred fifty-three".