20949617 has 8 divisors (see below), whose sum is σ = 22619520. Its totient is φ = 19288080.

The previous prime is 20949611. The next prime is 20949631. The reversal of 20949617 is 71694902.

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 20949617 - 2⁴ = 20949601 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20949611) 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, 3734 + ... + 7472.

It is an arithmetic number, because the mean of its divisors is an integer number (2827440).

Almost surely, 2^20949617 is an apocalyptic number.

It is an amenable number.

20949617 is a deficient number, since it is larger than the sum of its proper divisors (1669903).

20949617 is a wasteful number, since it uses less digits than its factorization.

20949617 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4183.

The product of its (nonzero) digits is 27216, while the sum is 38.

The square root of 20949617 is about 4577.0751577836. The cubic root of 20949617 is about 275.6716014635.

It can be divided in two parts, 2094 and 9617, that added together give a palindrome (11711).

The spelling of 20949617 in words is "twenty million, nine hundred forty-nine thousand, six hundred seventeen".