20849511 has 8 divisors (see below), whose sum is σ = 28324080. Its totient is φ = 13637312.

The previous prime is 20849509. The next prime is 20849519. The reversal of 20849511 is 11594802.

It is a happy number.

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 20849511 - 2¹ = 20849509 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20849519) 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, 65406 + ... + 65723.

It is an arithmetic number, because the mean of its divisors is an integer number (3540510).

Almost surely, 2^20849511 is an apocalyptic number.

20849511 is a deficient number, since it is larger than the sum of its proper divisors (7474569).

20849511 is a wasteful number, since it uses less digits than its factorization.

20849511 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 131185.

The product of its (nonzero) digits is 2880, while the sum is 30.

The square root of 20849511 is about 4566.1264765663. The cubic root of 20849511 is about 275.2318089514.

The spelling of 20849511 in words is "twenty million, eight hundred forty-nine thousand, five hundred eleven".