20949549 has 8 divisors (see below), whose sum is σ = 28120800. Its totient is φ = 13872336.

The previous prime is 20949547. The next prime is 20949563. The reversal of 20949549 is 94594902.

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

It is not a de Polignac number, because 20949549 - 2¹ = 20949547 is a prime.

It is a plaindrome in base 13.

It is a self number, because there is not a number n which added to its sum of digits gives 20949549.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20949541) 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, 22987 + ... + 23880.

It is an arithmetic number, because the mean of its divisors is an integer number (3515100).

Almost surely, 2^20949549 is an apocalyptic number.

It is an amenable number.

20949549 is a deficient number, since it is larger than the sum of its proper divisors (7171251).

20949549 is a wasteful number, since it uses less digits than its factorization.

20949549 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47019.

The product of its (nonzero) digits is 116640, while the sum is 42.

The square root of 20949549 is about 4577.0677294530. The cubic root of 20949549 is about 275.6713031973.

The spelling of 20949549 in words is "twenty million, nine hundred forty-nine thousand, five hundred forty-nine".