20163550 has 48 divisors (see below), whose sum is σ = 41653584. Its totient is φ = 7200000.

The previous prime is 20163529. The next prime is 20163551. The reversal of 20163550 is 5536102.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is a plaindrome in base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20163551) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 33250 + ... + 33850.

It is an arithmetic number, because the mean of its divisors is an integer number (867783).

Almost surely, 2^20163550 is an apocalyptic number.

20163550 is an abundant number, since it is smaller than the sum of its proper divisors (21490034).

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

20163550 is a wasteful number, since it uses less digits than its factorization.

20163550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 685 (or 680 counting only the distinct ones).

The product of its (nonzero) digits is 900, while the sum is 22.

The square root of 20163550 is about 4490.3841706473. The cubic root of 20163550 is about 272.1796589168.

Adding to 20163550 its reverse (5536102), we get a palindrome (25699652).

The spelling of 20163550 in words is "twenty million, one hundred sixty-three thousand, five hundred fifty".