Search a number
-
+
19717940 = 2251189627
BaseRepresentation
bin100101100110…
…1111100110100
31101002202221002
41023031330310
520021433230
61542342432
7326412464
oct113157464
941082832
1019717940
1110148420
12672aa18
134114c28
142893ba4
151ae7545
hex12cdf34

19717940 has 24 divisors (see below), whose sum is σ = 45172512. Its totient is φ = 7170080.

The previous prime is 19717937. The next prime is 19717967. The reversal of 19717940 is 4971791.

It is a junction number, because it is equal to n+sod(n) for n = 19717894 and 19717903.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 44594 + ... + 45033.

It is an arithmetic number, because the mean of its divisors is an integer number (1882188).

Almost surely, 219717940 is an apocalyptic number.

19717940 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

19717940 is an abundant number, since it is smaller than the sum of its proper divisors (25454572).

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

19717940 is a wasteful number, since it uses less digits than its factorization.

19717940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 89647 (or 89645 counting only the distinct ones).

The product of its (nonzero) digits is 15876, while the sum is 38.

The square root of 19717940 is about 4440.4887118424. The cubic root of 19717940 is about 270.1596677913.

The spelling of 19717940 in words is "nineteen million, seven hundred seventeen thousand, nine hundred forty".

Divisors: 1 2 4 5 10 11 20 22 44 55 110 220 89627 179254 358508 448135 896270 985897 1792540 1971794 3943588 4929485 9858970 19717940