20011457 has 4 divisors (see below), whose sum is σ = 20113236. Its totient is φ = 19909680.

The previous prime is 20011441. The next prime is 20011463. The reversal of 20011457 is 75411002.

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 15555136 + 4456321 = 3944^2 + 2111^2 .

It is a cyclic number.

It is not a de Polignac number, because 20011457 - 2⁴ = 20011441 is a prime.

It is a super-2 number, since 2×20011457² = 800916822525698, which contains 22 as substring.

It is a Duffinian 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 (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 50594 + ... + 50987.

It is an arithmetic number, because the mean of its divisors is an integer number (5028309).

Almost surely, 2^20011457 is an apocalyptic number.

It is an amenable number.

20011457 is a deficient number, since it is larger than the sum of its proper divisors (101779).

20011457 is a wasteful number, since it uses less digits than its factorization.

20011457 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 101778.

The product of its (nonzero) digits is 280, while the sum is 20.

The square root of 20011457 is about 4473.4167031476. The cubic root of 20011457 is about 271.4935835697.

Adding to 20011457 its reverse (75411002), we get a palindrome (95422459).

The spelling of 20011457 in words is "twenty million, eleven thousand, four hundred fifty-seven".