20071641 has 16 divisors (see below), whose sum is σ = 27316800. Its totient is φ = 13106880.

The previous prime is 20071637. The next prime is 20071643. The reversal of 20071641 is 14617002.

It is not a de Polignac number, because 20071641 - 2² = 20071637 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20071643) 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 15 ways as a sum of consecutive naturals, for example, 36831 + ... + 37371.

It is an arithmetic number, because the mean of its divisors is an integer number (1707300).

Almost surely, 2^20071641 is an apocalyptic number.

It is an amenable number.

20071641 is a deficient number, since it is larger than the sum of its proper divisors (7245159).

20071641 is a wasteful number, since it uses less digits than its factorization.

20071641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 776.

The product of its (nonzero) digits is 336, while the sum is 21.

The square root of 20071641 is about 4480.1385023233. The cubic root of 20071641 is about 271.7654814273.

Adding to 20071641 its reverse (14617002), we get a palindrome (34688643).

The spelling of 20071641 in words is "twenty million, seventy-one thousand, six hundred forty-one".