20612520 has 96 divisors (see below), whose sum is σ = 69189120. Its totient is φ = 5316480.

The previous prime is 20612513. The next prime is 20612521. The reversal of 20612520 is 2521602.

20612520 is a `hidden beast` number, since 2 + 0 + 612 + 52 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 20612493 and 20612502.

It is not an unprimeable number, because it can be changed into a prime (20612521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 10237 + ... + 12083.

It is an arithmetic number, because the mean of its divisors is an integer number (720720).

Almost surely, 2^20612520 is an apocalyptic number.

20612520 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 20612520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34594560).

20612520 is an abundant number, since it is smaller than the sum of its proper divisors (48576600).

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

20612520 is a wasteful number, since it uses less digits than its factorization.

20612520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1895 (or 1888 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 18.

The square root of 20612520 is about 4540.1013204553. The cubic root of 20612520 is about 274.1850030183.

The spelling of 20612520 in words is "twenty million, six hundred twelve thousand, five hundred twenty".