21221489920

素因数分解:

$2^8\times 5^1\times {\mathrm{911}}^1\times {\mathrm{18199}}^1$

素因数の和:19131

約数の個数: 72

約数和(自身を含む): 50890694400

約数和(自身を除く): 29669204480

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 32, 40, 64, 80, 128, 160, 256, 320, 640, 911, 1280, 1822, 3644, 4555, 7288, 9110, 14576, 18199, 18220, 29152, 36398, 36440, 58304, 72796, 72880, 90995, 116608, 145592, 145760, 181990, 233216, 291184, 291520, 363980, 582368, 583040, 727960, 1164736, 1166080, 1455920, 2329472, 2911840, 4658944, 5823680, 11647360, 16579289, 23294720, 33158578, 66317156, 82896445, 132634312, 165792890, 265268624, 331585780, 530537248, 663171560, 1061074496, 1326343120, 2122148992, 2652686240, 4244297984, 5305372480, 10610744960, 21221489920]

約数ペア:

[(1, 21221489920), (2, 10610744960), (4, 5305372480), (5, 4244297984), (8, 2652686240), (10, 2122148992), (16, 1326343120), (20, 1061074496), (32, 663171560), (40, 530537248), (64, 331585780), (80, 265268624), (128, 165792890), (160, 132634312), (256, 82896445), (320, 66317156), (640, 33158578), (911, 23294720), (1280, 16579289), (1822, 11647360), (3644, 5823680), (4555, 4658944), (7288, 2911840), (9110, 2329472), (14576, 1455920), (18199, 1166080), (18220, 1164736), (29152, 727960), (36398, 583040), (36440, 582368), (58304, 363980), (72796, 291520), (72880, 291184), (90995, 233216), (116608, 181990), (145592, 145760)]