20145156 has 24 divisors (see below), whose sum is σ = 48099744. Its totient is φ = 6558720.

The previous prime is 20145127. The next prime is 20145163. The reversal of 20145156 is 65154102.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19005 + ... + 20036.

It is an arithmetic number, because the mean of its divisors is an integer number (2004156).

Almost surely, 2^20145156 is an apocalyptic number.

It is an amenable number.

20145156 is an abundant number, since it is smaller than the sum of its proper divisors (27954588).

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

20145156 is a wasteful number, since it uses less digits than its factorization.

20145156 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39091 (or 39089 counting only the distinct ones).

The product of its (nonzero) digits is 1200, while the sum is 24.

The square root of 20145156 is about 4488.3355489535. The cubic root of 20145156 is about 272.0968693322.

Adding to 20145156 its reverse (65154102), we get a palindrome (85299258).

It can be divided in two parts, 20145 and 156, that added together give a triangular number (20301 = T₂₀₁).

The spelling of 20145156 in words is "twenty million, one hundred forty-five thousand, one hundred fifty-six".