20849545 has 4 divisors (see below), whose sum is σ = 25019460. Its totient is φ = 16679632.

The previous prime is 20849519. The next prime is 20849551. The reversal of 20849545 is 54594802.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 10679824 + 10169721 = 3268^2 + 3189^2 .

It is a cyclic number.

It is not a de Polignac number, because 20849545 - 2⁷ = 20849417 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2084950 + ... + 2084959.

It is an arithmetic number, because the mean of its divisors is an integer number (6254865).

Almost surely, 2^20849545 is an apocalyptic number.

It is an amenable number.

20849545 is a deficient number, since it is larger than the sum of its proper divisors (4169915).

20849545 is an equidigital number, since it uses as much as digits as its factorization.

20849545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4169914.

The product of its (nonzero) digits is 57600, while the sum is 37.

The square root of 20849545 is about 4566.1301996329. The cubic root of 20849545 is about 275.2319585612.

The spelling of 20849545 in words is "twenty million, eight hundred forty-nine thousand, five hundred forty-five".