156820 has 12 divisors (see below), whose sum is σ = 329364. Its totient is φ = 62720.

The previous prime is 156817. The next prime is 156823. The reversal of 156820 is 28651.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (156817) and next prime (156823).

It can be written as a sum of positive squares in 2 ways, for example, as 55696 + 101124 = 236^2 + 318^2 .

It is a junction number, because it is equal to n+sod(n) for n = 156791 and 156800.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (156823) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3901 + ... + 3940.

It is an arithmetic number, because the mean of its divisors is an integer number (27447).

2¹⁵⁶⁸²⁰ is an apocalyptic number.

156820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

156820 is an abundant number, since it is smaller than the sum of its proper divisors (172544).

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

156820 is a wasteful number, since it uses less digits than its factorization.

156820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7850 (or 7848 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 22.

The square root of 156820 is about 396.0050504728. The cubic root of 156820 is about 53.9262825847.

The spelling of 156820 in words is "one hundred fifty-six thousand, eight hundred twenty".