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20855802 = 23112231249
BaseRepresentation
bin100111110001…
…1101111111010
31110020120210010
41033203233322
520314341202
62023002350
7342162042
oct117435772
943216703
1020855802
1110855300
126b993b6
134422b16
142aac722
151c6e76c
hex13e3bfa

20855802 has 48 divisors (see below), whose sum is σ = 47880000. Its totient is φ = 6040320.

The previous prime is 20855789. The next prime is 20855831.

20855802 is nontrivially palindromic in base 10.

It is a Smith number, since the sum of its digits (30) coincides with the sum of the digits of its prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 20855802.

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 16074 + ... + 17322.

It is an arithmetic number, because the mean of its divisors is an integer number (997500).

Almost surely, 220855802 is an apocalyptic number.

20855802 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 20855802, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23940000).

20855802 is an abundant number, since it is smaller than the sum of its proper divisors (27024198).

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

20855802 is a wasteful number, since it uses less digits than its factorization.

20855802 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1299 (or 1288 counting only the distinct ones).

The product of its (nonzero) digits is 6400, while the sum is 30.

The square root of 20855802 is about 4566.8153017174. The cubic root of 20855802 is about 275.2594884046.

It can be divided in two parts, 2085 and 5802, that added together give a palindrome (7887).

The spelling of 20855802 in words is "twenty million, eight hundred fifty-five thousand, eight hundred two".