20817150 has 48 divisors (see below), whose sum is σ = 52054704. Its totient is φ = 5505280.

The previous prime is 20817143. The next prime is 20817221. The reversal of 20817150 is 5171802.

It is a self number, because there is not a number n which added to its sum of digits gives 20817150.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 20044 + ... + 21056.

It is an arithmetic number, because the mean of its divisors is an integer number (1084473).

Almost surely, 2^20817150 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20817150, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26027352).

20817150 is an abundant number, since it is smaller than the sum of its proper divisors (31237554).

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

20817150 is a wasteful number, since it uses less digits than its factorization.

20817150 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1165 (or 1160 counting only the distinct ones).

The product of its (nonzero) digits is 560, while the sum is 24.

The square root of 20817150 is about 4562.5815061213. The cubic root of 20817150 is about 275.0893373656.

Adding to 20817150 its reverse (5171802), we get a palindrome (25988952).

The spelling of 20817150 in words is "twenty million, eight hundred seventeen thousand, one hundred fifty".