20545616 has 80 divisors (see below), whose sum is σ = 49830144. Its totient is φ = 7990272.

The previous prime is 20545607. The next prime is 20545663. The reversal of 20545616 is 61654502.

It is a congruent number.

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, 149900 + ... + 150036.

Almost surely, 2^20545616 is an apocalyptic number.

20545616 is a gapful number since it is divisible by the number (26) 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 20545616, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24915072).

20545616 is an abundant number, since it is smaller than the sum of its proper divisors (29284528).

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

20545616 is a wasteful number, since it uses less digits than its factorization.

20545616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 268 (or 262 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 29.

The square root of 20545616 is about 4532.7272143821. The cubic root of 20545616 is about 273.8880321103. Note that the first 3 decimals are identical.

The spelling of 20545616 in words is "twenty million, five hundred forty-five thousand, six hundred sixteen".