20545630 has 48 divisors (see below), whose sum is σ = 43898400. Its totient is φ = 6781824.

The previous prime is 20545607. The next prime is 20545663. The reversal of 20545630 is 3654502.

It is a junction number, because it is equal to n+sod(n) for n = 20545595 and 20545604.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 58696 + ... + 59044.

It is an arithmetic number, because the mean of its divisors is an integer number (914550).

Almost surely, 2^20545630 is an apocalyptic number.

20545630 is an abundant number, since it is smaller than the sum of its proper divisors (23352770).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20545630 is a wasteful number, since it uses less digits than its factorization.

20545630 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 421 (or 392 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 25.

The square root of 20545630 is about 4532.7287587060. The cubic root of 20545630 is about 273.8880943204. Note that the first 3 decimals are identical.

The spelling of 20545630 in words is "twenty million, five hundred forty-five thousand, six hundred thirty".