155210020 has 48 divisors (see below), whose sum is σ = 375838848. Its totient is φ = 52738560.

The previous prime is 155209987. The next prime is 155210057. The reversal of 155210020 is 20012551.

It is a junction number, because it is equal to n+sod(n) for n = 155209976 and 155210003.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10915 + ... + 20725.

It is an arithmetic number, because the mean of its divisors is an integer number (7829976).

Almost surely, 2^155210020 is an apocalyptic number.

155210020 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 155210020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (187919424).

155210020 is an abundant number, since it is smaller than the sum of its proper divisors (220628828).

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

155210020 is a wasteful number, since it uses less digits than its factorization.

155210020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9940 (or 9938 counting only the distinct ones).

The product of its (nonzero) digits is 100, while the sum is 16.

The square root of 155210020 is about 12458.3313489408. The cubic root of 155210020 is about 537.4110413441.

Adding to 155210020 its reverse (20012551), we get a palindrome (175222571).

The spelling of 155210020 in words is "one hundred fifty-five million, two hundred ten thousand, twenty".