20641277 has 8 divisors (see below), whose sum is σ = 21896160. Its totient is φ = 19403280.

The previous prime is 20641267. The next prime is 20641279. The reversal of 20641277 is 77214602.

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

It is a cyclic number.

It is not a de Polignac number, because 20641277 - 2¹² = 20637181 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 (20641279) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1658 + ... + 6635.

It is an arithmetic number, because the mean of its divisors is an integer number (2737020).

Almost surely, 2^20641277 is an apocalyptic number.

It is an amenable number.

20641277 is a deficient number, since it is larger than the sum of its proper divisors (1254883).

20641277 is a wasteful number, since it uses less digits than its factorization.

20641277 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8443.

The product of its (nonzero) digits is 4704, while the sum is 29.

The square root of 20641277 is about 4543.2672164424. The cubic root of 20641277 is about 274.3124510328.

Adding to 20641277 its reverse (77214602), we get a palindrome (97855879).

The spelling of 20641277 in words is "twenty million, six hundred forty-one thousand, two hundred seventy-seven".