20457361 has 4 divisors (see below), whose sum is σ = 20892672. Its totient is φ = 20022052.

The previous prime is 20457347. The next prime is 20457377. The reversal of 20457361 is 16375402.

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 20457361 - 2¹⁹ = 19933073 is a prime.

It is a super-3 number, since 3×20457361³ (a number of 23 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20457391) 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, 217585 + ... + 217678.

It is an arithmetic number, because the mean of its divisors is an integer number (5223168).

Almost surely, 2^20457361 is an apocalyptic number.

It is an amenable number.

20457361 is a deficient number, since it is larger than the sum of its proper divisors (435311).

20457361 is an equidigital number, since it uses as much as digits as its factorization.

20457361 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 435310.

The product of its (nonzero) digits is 5040, while the sum is 28.

The square root of 20457361 is about 4522.9814282175. The cubic root of 20457361 is about 273.4953014198.

The spelling of 20457361 in words is "twenty million, four hundred fifty-seven thousand, three hundred sixty-one".