155620 has 24 divisors (see below), whose sum is σ = 338688. Its totient is φ = 60000.

The previous prime is 155609. The next prime is 155621. The reversal of 155620 is 26551.

It is a happy number.

It is a hoax number, since the sum of its digits (19) coincides with the sum of the digits of its distinct prime factors.

It is a plaindrome in base 13.

It is a zygodrome in base 13.

It is not an unprimeable number, because it can be changed into a prime (155621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 495 + ... + 745.

It is an arithmetic number, because the mean of its divisors is an integer number (14112).

155620 is a Friedman number, since it can be written as 10*(6^5+5)*2, using all its digits and the basic arithmetic operations.

2¹⁵⁵⁶²⁰ is an apocalyptic number.

155620 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 155620, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (169344).

155620 is an abundant number, since it is smaller than the sum of its proper divisors (183068).

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

155620 is a wasteful number, since it uses less digits than its factorization.

155620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 291 (or 289 counting only the distinct ones).

The product of its (nonzero) digits is 300, while the sum is 19.

The square root of 155620 is about 394.4870086581. The cubic root of 155620 is about 53.7883807359.

It can be divided in two parts, 155 and 620, that multiplied together give a square (96100 = 310²).

The spelling of 155620 in words is "one hundred fifty-five thousand, six hundred twenty".