20130156 has 36 divisors (see below), whose sum is σ = 51505272. Its totient is φ = 6628224.

The previous prime is 20130079. The next prime is 20130163. The reversal of 20130156 is 65103102.

It is a tau number, because it is divible by the number of its divisors (36).

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

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 381 + ... + 6356.

It is an arithmetic number, because the mean of its divisors is an integer number (1430702).

Almost surely, 2^20130156 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20130156, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25752636).

20130156 is an abundant number, since it is smaller than the sum of its proper divisors (31375116).

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

20130156 is a wasteful number, since it uses less digits than its factorization.

20130156 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6830 (or 6825 counting only the distinct ones).

The product of its (nonzero) digits is 180, while the sum is 18.

The square root of 20130156 is about 4486.6642397220. The cubic root of 20130156 is about 272.0293184948.

Adding to 20130156 its reverse (65103102), we get a palindrome (85233258).

It can be divided in two parts, 2013015 and 6, that added together give a triangular number (2013021 = T₂₀₀₆).

The spelling of 20130156 in words is "twenty million, one hundred thirty thousand, one hundred fifty-six".