20153550 has 96 divisors (see below), whose sum is σ = 53434080. Its totient is φ = 5017600.

The previous prime is 20153531. The next prime is 20153561. The reversal of 20153550 is 5535102.

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, 178294 + ... + 178406.

It is an arithmetic number, because the mean of its divisors is an integer number (556605).

Almost surely, 2^20153550 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20153550, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26717040).

20153550 is an abundant number, since it is smaller than the sum of its proper divisors (33280530).

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

20153550 is a wasteful number, since it uses less digits than its factorization.

20153550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 198 (or 193 counting only the distinct ones).

The product of its (nonzero) digits is 750, while the sum is 21.

The square root of 20153550 is about 4489.2705420814. The cubic root of 20153550 is about 272.1346561492.

Adding to 20153550 its reverse (5535102), we get a palindrome (25688652).

It can be divided in two parts, 2015 and 3550, that added together give a triangular number (5565 = T₁₀₅).

The spelling of 20153550 in words is "twenty million, one hundred fifty-three thousand, five hundred fifty".