20166457 has 4 divisors (see below), whose sum is σ = 20325376. Its totient is φ = 20007540.

The previous prime is 20166451. The next prime is 20166463. The reversal of 20166457 is 75466102.

It is a happy number.

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, and also an emirpimes, since its reverse is a distinct semiprime: 75466102 = 2 ⋅37733051.

It is an interprime number because it is at equal distance from previous prime (20166451) and next prime (20166463).

It is a cyclic number.

It is not a de Polignac number, because 20166457 - 2⁷ = 20166329 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20166451) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 79269 + ... + 79522.

It is an arithmetic number, because the mean of its divisors is an integer number (5081344).

Almost surely, 2^20166457 is an apocalyptic number.

It is an amenable number.

20166457 is a deficient number, since it is larger than the sum of its proper divisors (158919).

20166457 is a wasteful number, since it uses less digits than its factorization.

20166457 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 158918.

The product of its (nonzero) digits is 10080, while the sum is 31.

The square root of 20166457 is about 4490.7078506623. The cubic root of 20166457 is about 272.1927384299.

The spelling of 20166457 in words is "twenty million, one hundred sixty-six thousand, four hundred fifty-seven".