20545308 has 108 divisors (see below), whose sum is σ = 63696360. Its totient is φ = 5552064.

The previous prime is 20545303. The next prime is 20545309. The reversal of 20545308 is 80354502.

20545308 is a `hidden beast` number, since 205 + 453 + 0 + 8 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20545303) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 33210 + ... + 33822.

Almost surely, 2^20545308 is an apocalyptic number.

20545308 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20545308, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31848180).

20545308 is an abundant number, since it is smaller than the sum of its proper divisors (43151052).

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

20545308 is a wasteful number, since it uses less digits than its factorization.

20545308 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 656 (or 644 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 27.

The square root of 20545308 is about 4532.6932391240. The cubic root of 20545308 is about 273.8866634820.

The spelling of 20545308 in words is "twenty million, five hundred forty-five thousand, three hundred eight".