20011357 has 4 divisors (see below), whose sum is σ = 20881440. Its totient is φ = 19141276.

The previous prime is 20011349. The next prime is 20011361. The reversal of 20011357 is 75311002.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20011357 - 2³ = 20011349 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20011657) 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 in 3 ways as a sum of consecutive naturals, for example, 435007 + ... + 435052.

It is an arithmetic number, because the mean of its divisors is an integer number (5220360).

Almost surely, 2^20011357 is an apocalyptic number.

It is an amenable number.

20011357 is a deficient number, since it is larger than the sum of its proper divisors (870083).

20011357 is an equidigital number, since it uses as much as digits as its factorization.

20011357 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 870082.

The product of its (nonzero) digits is 210, while the sum is 19.

The square root of 20011357 is about 4473.4055259947. The cubic root of 20011357 is about 271.4931313387.

Adding to 20011357 its reverse (75311002), we get a palindrome (95322359).

The spelling of 20011357 in words is "twenty million, eleven thousand, three hundred fifty-seven".