20641611 has 8 divisors (see below), whose sum is σ = 27578880. Its totient is φ = 13732712.

The previous prime is 20641609. The next prime is 20641627. The reversal of 20641611 is 11614602.

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 20641611 - 2¹ = 20641609 is a prime.

It is a super-2 number, since 2×20641611² = 852152209350642, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20641631) 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, 5331 + ... + 8348.

It is an arithmetic number, because the mean of its divisors is an integer number (3447360).

Almost surely, 2^20641611 is an apocalyptic number.

20641611 is a deficient number, since it is larger than the sum of its proper divisors (6937269).

20641611 is a wasteful number, since it uses less digits than its factorization.

20641611 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14185.

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

The square root of 20641611 is about 4543.3039739819. The cubic root of 20641611 is about 274.3139305902.

The spelling of 20641611 in words is "twenty million, six hundred forty-one thousand, six hundred eleven".