20271657 has 8 divisors (see below), whose sum is σ = 30890176. Its totient is φ = 11583792.

The previous prime is 20271623. The next prime is 20271661. The reversal of 20271657 is 75617202.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20271657 - 2⁶ = 20271593 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20271607) 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 7 ways as a sum of consecutive naturals, for example, 482638 + ... + 482679.

It is an arithmetic number, because the mean of its divisors is an integer number (3861272).

Almost surely, 2^20271657 is an apocalyptic number.

It is an amenable number.

20271657 is a deficient number, since it is larger than the sum of its proper divisors (10618519).

20271657 is an equidigital number, since it uses as much as digits as its factorization.

20271657 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 965327.

The product of its (nonzero) digits is 5880, while the sum is 30.

The square root of 20271657 is about 4502.4056902949. The cubic root of 20271657 is about 272.6652231465.

Adding to 20271657 its reverse (75617202), we get a palindrome (95888859).

The spelling of 20271657 in words is "twenty million, two hundred seventy-one thousand, six hundred fifty-seven".