20410457 has 4 divisors (see below), whose sum is σ = 20430756. Its totient is φ = 20390160.

The previous prime is 20410433. The next prime is 20410463. The reversal of 20410457 is 75401402.

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 7529536 + 12880921 = 2744^2 + 3589^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20410457 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20410477) 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, 8558 + ... + 10679.

It is an arithmetic number, because the mean of its divisors is an integer number (5107689).

Almost surely, 2^20410457 is an apocalyptic number.

It is an amenable number.

20410457 is a deficient number, since it is larger than the sum of its proper divisors (20299).

20410457 is a wasteful number, since it uses less digits than its factorization.

20410457 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20298.

The product of its (nonzero) digits is 1120, while the sum is 23.

The square root of 20410457 is about 4517.7933773027. The cubic root of 20410457 is about 273.2861209684.

Adding to 20410457 its reverse (75401402), we get a palindrome (95811859).

The spelling of 20410457 in words is "twenty million, four hundred ten thousand, four hundred fifty-seven".