20941520 has 40 divisors (see below), whose sum is σ = 49428384. Its totient is φ = 8249472.

The previous prime is 20941511. The next prime is 20941537. The reversal of 20941520 is 2514902.

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3407 + ... + 7313.

Almost surely, 2^20941520 is an apocalyptic number.

20941520 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 20941520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24714192).

20941520 is an abundant number, since it is smaller than the sum of its proper divisors (28486864).

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

20941520 is a wasteful number, since it uses less digits than its factorization.

20941520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3987 (or 3981 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 23.

The square root of 20941520 is about 4576.1905554730. The cubic root of 20941520 is about 275.6360813140.

The spelling of 20941520 in words is "twenty million, nine hundred forty-one thousand, five hundred twenty".