20271601 has 4 divisors (see below), whose sum is σ = 23167552. Its totient is φ = 17375652.

The previous prime is 20271593. The next prime is 20271607. The reversal of 20271601 is 10617202.

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 not a de Polignac number, because 20271601 - 2³ = 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 (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1447965 + ... + 1447978.

It is an arithmetic number, because the mean of its divisors is an integer number (5791888).

Almost surely, 2^20271601 is an apocalyptic number.

It is an amenable number.

20271601 is a deficient number, since it is larger than the sum of its proper divisors (2895951).

20271601 is an equidigital number, since it uses as much as digits as its factorization.

20271601 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2895950.

The product of its (nonzero) digits is 168, while the sum is 19.

The square root of 20271601 is about 4502.3994713930. The cubic root of 20271601 is about 272.6649720690.

Adding to 20271601 its reverse (10617202), we get a palindrome (30888803).

The spelling of 20271601 in words is "twenty million, two hundred seventy-one thousand, six hundred one".