20475624 has 128 divisors (see below), whose sum is σ = 59673600. Its totient is φ = 5806080.

The previous prime is 20475613. The next prime is 20475641. The reversal of 20475624 is 42657402.

It is a Cunningham number, because it is equal to 4525²-1.

It is a junction number, because it is equal to n+sod(n) for n = 20475591 and 20475600.

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 31 ways as a sum of consecutive naturals, for example, 280452 + ... + 280524.

It is an arithmetic number, because the mean of its divisors is an integer number (466200).

Almost surely, 2^20475624 is an apocalyptic number.

20475624 is a gapful number since it is divisible by the number (24) 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 20475624, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29836800).

20475624 is an abundant number, since it is smaller than the sum of its proper divisors (39197976).

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

20475624 is a wasteful number, since it uses less digits than its factorization.

20475624 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 155 (or 151 counting only the distinct ones).

The product of its (nonzero) digits is 13440, while the sum is 30.

The square root of 20475624 is about 4524.9998895028. Note that the first 3 decimals coincide. The cubic root of 20475624 is about 273.5766634793.

The spelling of 20475624 in words is "twenty million, four hundred seventy-five thousand, six hundred twenty-four".