20849829 has 64 divisors (see below), whose sum is σ = 38320128. Its totient is φ = 9734400.

The previous prime is 20849813. The next prime is 20849839. The reversal of 20849829 is 92894802.

It is not a de Polignac number, because 20849829 - 2⁴ = 20849813 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20849809) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 159094 + ... + 159224.

It is an arithmetic number, because the mean of its divisors is an integer number (598752).

Almost surely, 2^20849829 is an apocalyptic number.

It is an amenable number.

20849829 is a deficient number, since it is larger than the sum of its proper divisors (17470299).

20849829 is a wasteful number, since it uses less digits than its factorization.

20849829 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 218.

The product of its (nonzero) digits is 82944, while the sum is 42.

The square root of 20849829 is about 4566.1612980708. The cubic root of 20849829 is about 275.2332082371.

The spelling of 20849829 in words is "twenty million, eight hundred forty-nine thousand, eight hundred twenty-nine".