20471550 has 96 divisors (see below), whose sum is σ = 58389120. Its totient is φ = 4694400.

The previous prime is 20471497. The next prime is 20471579. The reversal of 20471550 is 5517402.

It is a self number, because there is not a number n which added to its sum of digits gives 20471550.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 31024 + ... + 31676.

It is an arithmetic number, because the mean of its divisors is an integer number (608220).

Almost surely, 2^20471550 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20471550, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29194560).

20471550 is an abundant number, since it is smaller than the sum of its proper divisors (37917570).

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

20471550 is a wasteful number, since it uses less digits than its factorization.

20471550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 698 (or 693 counting only the distinct ones).

The product of its (nonzero) digits is 1400, while the sum is 24.

The square root of 20471550 is about 4524.5497013515. The cubic root of 20471550 is about 273.5585179150.

Adding to 20471550 its reverse (5517402), we get a palindrome (25988952).

The spelling of 20471550 in words is "twenty million, four hundred seventy-one thousand, five hundred fifty".