20849305 has 16 divisors (see below), whose sum is σ = 25502400. Its totient is φ = 16361280.

The previous prime is 20849273. The next prime is 20849317. The reversal of 20849305 is 50394802.

It is not a de Polignac number, because 20849305 - 2⁵ = 20849273 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 90931 + ... + 91159.

It is an arithmetic number, because the mean of its divisors is an integer number (1593900).

Almost surely, 2^20849305 is an apocalyptic number.

It is an amenable number.

20849305 is a deficient number, since it is larger than the sum of its proper divisors (4653095).

20849305 is a wasteful number, since it uses less digits than its factorization.

20849305 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 504.

The product of its (nonzero) digits is 8640, while the sum is 31.

The square root of 20849305 is about 4566.1039190978. The cubic root of 20849305 is about 275.2309024883.

The spelling of 20849305 in words is "twenty million, eight hundred forty-nine thousand, three hundred five".