20963520 has 168 divisors, whose sum is σ = 74889360. Its totient is φ = 5376000.

The previous prime is 20963507. The next prime is 20963521. The reversal of 20963520 is 2536902.

20963520 is a `hidden beast` number, since 2 + 0 + 9 + 635 + 20 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20963521) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 83395 + ... + 83645.

It is an arithmetic number, because the mean of its divisors is an integer number (445770).

Almost surely, 2^20963520 is an apocalyptic number.

20963520 is a gapful number since it is divisible by the number (20) 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 20963520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37444680).

20963520 is an abundant number, since it is smaller than the sum of its proper divisors (53925840).

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

20963520 is a wasteful number, since it uses less digits than its factorization.

20963520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 303 (or 290 counting only the distinct ones).

The product of its (nonzero) digits is 3240, while the sum is 27.

The square root of 20963520 is about 4578.5936705499. The cubic root of 20963520 is about 275.7325701955.

The spelling of 20963520 in words is "twenty million, nine hundred sixty-three thousand, five hundred twenty".