20155304 has 32 divisors (see below), whose sum is σ = 41653920. Its totient is φ = 9084096.

The previous prime is 20155283. The next prime is 20155307. The reversal of 20155304 is 40355102.

It is not an unprimeable number, because it can be changed into a prime (20155307) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2219 + ... + 6725.

It is an arithmetic number, because the mean of its divisors is an integer number (1301685).

Almost surely, 2^20155304 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 20155304, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20826960).

20155304 is an abundant number, since it is smaller than the sum of its proper divisors (21498616).

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

20155304 is a wasteful number, since it uses less digits than its factorization.

20155304 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4569 (or 4565 counting only the distinct ones).

The product of its (nonzero) digits is 600, while the sum is 20.

The square root of 20155304 is about 4489.4658925088. The cubic root of 20155304 is about 272.1425507110.

It can be divided in two parts, 2015530 and 4, that multiplied together give a triangular number (8062120 = T₄₀₁₅).

The spelling of 20155304 in words is "twenty million, one hundred fifty-five thousand, three hundred four".