20971980

素因数分解:

$2^2\times 3^3\times 5^1\times {\mathrm{71}}^1\times {\mathrm{547}}^1$

素因数の和:636

約数の個数: 96

約数和(自身を含む): 66286080

約数和(自身を除く): 45314100

約数列:

[1, 2, 3, 4, 5, 6, 9, 10, 12, 15, 18, 20, 27, 30, 36, 45, 54, 60, 71, 90, 108, 135, 142, 180, 213, 270, 284, 355, 426, 540, 547, 639, 710, 852, 1065, 1094, 1278, 1420, 1641, 1917, 2130, 2188, 2556, 2735, 3195, 3282, 3834, 4260, 4923, 5470, 6390, 6564, 7668, 8205, 9585, 9846, 10940, 12780, 14769, 16410, 19170, 19692, 24615, 29538, 32820, 38340, 38837, 49230, 59076, 73845, 77674, 98460, 116511, 147690, 155348, 194185, 233022, 295380, 349533, 388370, 466044, 582555, 699066, 776740, 1048599, 1165110, 1398132, 1747665, 2097198, 2330220, 3495330, 4194396, 5242995, 6990660, 10485990, 20971980]

約数ペア:

[(1, 20971980), (2, 10485990), (3, 6990660), (4, 5242995), (5, 4194396), (6, 3495330), (9, 2330220), (10, 2097198), (12, 1747665), (15, 1398132), (18, 1165110), (20, 1048599), (27, 776740), (30, 699066), (36, 582555), (45, 466044), (54, 388370), (60, 349533), (71, 295380), (90, 233022), (108, 194185), (135, 155348), (142, 147690), (180, 116511), (213, 98460), (270, 77674), (284, 73845), (355, 59076), (426, 49230), (540, 38837), (547, 38340), (639, 32820), (710, 29538), (852, 24615), (1065, 19692), (1094, 19170), (1278, 16410), (1420, 14769), (1641, 12780), (1917, 10940), (2130, 9846), (2188, 9585), (2556, 8205), (2735, 7668), (3195, 6564), (3282, 6390), (3834, 5470), (4260, 4923)]