20202155550 has 144 divisors (see below), whose sum is σ = 54876800160. Its totient is φ = 5328011520.

The previous prime is 20202155549. The next prime is 20202155573. The reversal of 20202155550 is 5555120202.

20202155550 is a `hidden beast` number, since 20 + 20 + 21 + 55 + 550 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 19004319 + ... + 19005381.

It is an arithmetic number, because the mean of its divisors is an integer number (381088890).

Almost surely, 2^20202155550 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20202155550, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27438400080).

20202155550 is an abundant number, since it is smaller than the sum of its proper divisors (34674644610).

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

20202155550 is a wasteful number, since it uses less digits than its factorization.

20202155550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1507 (or 1499 counting only the distinct ones).

The product of its (nonzero) digits is 5000, while the sum is 27.

Adding to 20202155550 its reverse (5555120202), we get a palindrome (25757275752).

The spelling of 20202155550 in words is "twenty billion, two hundred two million, one hundred fifty-five thousand, five hundred fifty".