20736520 has 64 divisors (see below), whose sum is σ = 55065600. Its totient is φ = 6877440.

The previous prime is 20736511. The next prime is 20736577. The reversal of 20736520 is 2563702.

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, 7486 + ... + 9874.

It is an arithmetic number, because the mean of its divisors is an integer number (860400).

Almost surely, 2^20736520 is an apocalyptic number.

20736520 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 20736520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27532800).

20736520 is an abundant number, since it is smaller than the sum of its proper divisors (34329080).

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

20736520 is a wasteful number, since it uses less digits than its factorization.

20736520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2438 (or 2434 counting only the distinct ones).

The product of its (nonzero) digits is 2520, while the sum is 25.

The square root of 20736520 is about 4553.7369269645. The cubic root of 20736520 is about 274.7337146882.

The spelling of 20736520 in words is "twenty million, seven hundred thirty-six thousand, five hundred twenty".