20649941 has 24 divisors (see below), whose sum is σ = 24156000. Its totient is φ = 17589312.

The previous prime is 20649931. The next prime is 20649947. The reversal of 20649941 is 14994602.

It is not a de Polignac number, because 20649941 - 2¹⁸ = 20387797 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 (20649947) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 189395 + ... + 189503.

It is an arithmetic number, because the mean of its divisors is an integer number (1006500).

Almost surely, 2^20649941 is an apocalyptic number.

It is an amenable number.

20649941 is a deficient number, since it is larger than the sum of its proper divisors (3506059).

20649941 is a wasteful number, since it uses less digits than its factorization.

20649941 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 213 (or 200 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 35.

The square root of 20649941 is about 4544.2206152431. The cubic root of 20649941 is about 274.3508257682.

The spelling of 20649941 in words is "twenty million, six hundred forty-nine thousand, nine hundred forty-one".