20849530 has 40 divisors (see below), whose sum is σ = 41213412. Its totient is φ = 7592832.

The previous prime is 20849519. The next prime is 20849551. The reversal of 20849530 is 3594802.

It can be written as a sum of positive squares in 10 ways, for example, as 11108889 + 9740641 = 3333^2 + 3121^2 .

It is a nialpdrome in base 13.

It is a junction number, because it is equal to n+sod(n) for n = 20849492 and 20849501.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 285574 + ... + 285646.

Almost surely, 2^20849530 is an apocalyptic number.

20849530 is a deficient number, since it is larger than the sum of its proper divisors (20363882).

20849530 is an frugal number, since it uses more digits than its factorization.

20849530 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 132 (or 93 counting only the distinct ones).

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

The square root of 20849530 is about 4566.1285571039. The cubic root of 20849530 is about 275.2318925569.

The spelling of 20849530 in words is "twenty million, eight hundred forty-nine thousand, five hundred thirty".