20860136 has 32 divisors (see below), whose sum is σ = 43109280. Its totient is φ = 9384000.

The previous prime is 20860097. The next prime is 20860163. The reversal of 20860136 is 63106802.

It is a Smith number, since the sum of its digits (26) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7715 + ... + 10061.

It is an arithmetic number, because the mean of its divisors is an integer number (1347165).

Almost surely, 2^20860136 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 20860136, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21554640).

20860136 is an abundant number, since it is smaller than the sum of its proper divisors (22249144).

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

20860136 is a wasteful number, since it uses less digits than its factorization.

20860136 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2465 (or 2461 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 26.

The square root of 20860136 is about 4567.2897871714. The cubic root of 20860136 is about 275.2785541142.

Adding to 20860136 its reverse (63106802), we get a palindrome (83966938).

The spelling of 20860136 in words is "twenty million, eight hundred sixty thousand, one hundred thirty-six".