155500020 has 192 divisors, whose sum is σ = 552061440. Its totient is φ = 35997696.

The previous prime is 155499989. The next prime is 155500043. The reversal of 155500020 is 20005551.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 155499966 and 155500002.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 118689 + ... + 119991.

It is an arithmetic number, because the mean of its divisors is an integer number (2875320).

Almost surely, 2^155500020 is an apocalyptic number.

155500020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 155500020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (276030720).

155500020 is an abundant number, since it is smaller than the sum of its proper divisors (396561420).

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

155500020 is a wasteful number, since it uses less digits than its factorization.

155500020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1351 (or 1343 counting only the distinct ones).

The product of its (nonzero) digits is 250, while the sum is 18.

The square root of 155500020 is about 12469.9647152668. The cubic root of 155500020 is about 537.7455391595.

Adding to 155500020 its reverse (20005551), we get a palindrome (175505571).

The spelling of 155500020 in words is "one hundred fifty-five million, five hundred thousand, twenty".