20155436 has 48 divisors (see below), whose sum is σ = 41950272. Its totient is φ = 8294400.

The previous prime is 20155427. The next prime is 20155441. The reversal of 20155436 is 63455102.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 111266 + ... + 111446.

It is an arithmetic number, because the mean of its divisors is an integer number (873964).

Almost surely, 2^20155436 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 20155436, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20975136).

20155436 is an abundant number, since it is smaller than the sum of its proper divisors (21794836).

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

20155436 is a wasteful number, since it uses less digits than its factorization.

20155436 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 330 (or 328 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 26.

The square root of 20155436 is about 4489.4805935654. The cubic root of 20155436 is about 272.1431448100.

It can be divided in two parts, 2015 and 5436, that multiplied together give a triangular number (10953540 = T₄₆₈₀).

The spelling of 20155436 in words is "twenty million, one hundred fifty-five thousand, four hundred thirty-six".