20181502 has 16 divisors (see below), whose sum is σ = 33918192. Its totient is φ = 8925120.

The previous prime is 20181487. The next prime is 20181503. The reversal of 20181502 is 20518102.

It is a self number, because there is not a number n which added to its sum of digits gives 20181502.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20181503) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11583 + ... + 13210.

It is an arithmetic number, because the mean of its divisors is an integer number (2119887).

Almost surely, 2^20181502 is an apocalyptic number.

20181502 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

20181502 is a deficient number, since it is larger than the sum of its proper divisors (13736690).

20181502 is a wasteful number, since it uses less digits than its factorization.

20181502 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24843.

The product of its (nonzero) digits is 160, while the sum is 19.

The square root of 20181502 is about 4492.3826640214. The cubic root of 20181502 is about 272.2604105680.

Adding to 20181502 its reverse (20518102), we get a palindrome (40699604).

The spelling of 20181502 in words is "twenty million, one hundred eighty-one thousand, five hundred two".