20506524 has 48 divisors (see below), whose sum is σ = 50319360. Its totient is φ = 6487360.

The previous prime is 20506517. The next prime is 20506543. The reversal of 20506524 is 42560502.

It is a junction number, because it is equal to n+sod(n) for n = 20506494 and 20506503.

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, 52522 + ... + 52910.

It is an arithmetic number, because the mean of its divisors is an integer number (1048320).

Almost surely, 2^20506524 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20506524, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25159680).

20506524 is an abundant number, since it is smaller than the sum of its proper divisors (29812836).

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

20506524 is a wasteful number, since it uses less digits than its factorization.

20506524 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 610 (or 608 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 24.

The square root of 20506524 is about 4528.4129670338. The cubic root of 20506524 is about 273.7142135409.

The spelling of 20506524 in words is "twenty million, five hundred six thousand, five hundred twenty-four".