20661141 has 8 divisors (see below), whose sum is σ = 27573664. Its totient is φ = 13761360.

The previous prime is 20661139. The next prime is 20661143. The reversal of 20661141 is 14116602.

It is an interprime number because it is at equal distance from previous prime (20661139) and next prime (20661143).

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

It is not a de Polignac number, because 20661141 - 2¹ = 20661139 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20661143) 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 7 ways as a sum of consecutive naturals, for example, 1650 + ... + 6636.

It is an arithmetic number, because the mean of its divisors is an integer number (3446708).

Almost surely, 2^20661141 is an apocalyptic number.

It is an amenable number.

20661141 is a deficient number, since it is larger than the sum of its proper divisors (6912523).

20661141 is a wasteful number, since it uses less digits than its factorization.

20661141 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6371.

The product of its (nonzero) digits is 288, while the sum is 21.

The square root of 20661141 is about 4545.4527827269. The cubic root of 20661141 is about 274.4004170946.

Adding to 20661141 its reverse (14116602), we get a palindrome (34777743).

It can be divided in two parts, 20661 and 141, that added together give a palindrome (20802).

The spelling of 20661141 in words is "twenty million, six hundred sixty-one thousand, one hundred forty-one".