Search a number
-
+
19802080 = 255235381
BaseRepresentation
bin100101110001…
…0011111100000
31101021001100101
41023202133200
520032131310
61544232144
7330213004
oct113423740
941231311
1019802080
11101a5661
12676b654
13414430c
1428b6704
151b1243a
hex12e27e0

19802080 has 48 divisors (see below), whose sum is σ = 48825504. Its totient is φ = 7575040.

The previous prime is 19802077. The next prime is 19802089. The reversal of 19802080 is 8020891.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19802089) 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, 990 + ... + 6370.

It is an arithmetic number, because the mean of its divisors is an integer number (1017198).

Almost surely, 219802080 is an apocalyptic number.

19802080 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 19802080, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24412752).

19802080 is an abundant number, since it is smaller than the sum of its proper divisors (29023424).

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

19802080 is a wasteful number, since it uses less digits than its factorization.

19802080 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5419 (or 5411 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 28.

The square root of 19802080 is about 4449.9528087385. The cubic root of 19802080 is about 270.5433958096.

The spelling of 19802080 in words is "nineteen million, eight hundred two thousand, eighty".

Divisors: 1 2 4 5 8 10 16 20 23 32 40 46 80 92 115 160 184 230 368 460 736 920 1840 3680 5381 10762 21524 26905 43048 53810 86096 107620 123763 172192 215240 247526 430480 495052 618815 860960 990104 1237630 1980208 2475260 3960416 4950520 9901040 19802080