20721456

素因数分解:

$2^4\times 3^2\times 7^1\times {\mathrm{61}}^1\times {\mathrm{337}}^1$

素因数の和:419

約数の個数: 120

約数和(自身を含む): 67562144

約数和(自身を除く): 46840688

約数列:

[1, 2, 3, 4, 6, 7, 8, 9, 12, 14, 16, 18, 21, 24, 28, 36, 42, 48, 56, 61, 63, 72, 84, 112, 122, 126, 144, 168, 183, 244, 252, 336, 337, 366, 427, 488, 504, 549, 674, 732, 854, 976, 1008, 1011, 1098, 1281, 1348, 1464, 1708, 2022, 2196, 2359, 2562, 2696, 2928, 3033, 3416, 3843, 4044, 4392, 4718, 5124, 5392, 6066, 6832, 7077, 7686, 8088, 8784, 9436, 10248, 12132, 14154, 15372, 16176, 18872, 20496, 20557, 21231, 24264, 28308, 30744, 37744, 41114, 42462, 48528, 56616, 61488, 61671, 82228, 84924, 113232, 123342, 143899, 164456, 169848, 185013, 246684, 287798, 328912, 339696, 370026, 431697, 493368, 575596, 740052, 863394, 986736, 1151192, 1295091, 1480104, 1726788, 2302384, 2590182, 2960208, 3453576, 5180364, 6907152, 10360728, 20721456]

約数ペア:

[(1, 20721456), (2, 10360728), (3, 6907152), (4, 5180364), (6, 3453576), (7, 2960208), (8, 2590182), (9, 2302384), (12, 1726788), (14, 1480104), (16, 1295091), (18, 1151192), (21, 986736), (24, 863394), (28, 740052), (36, 575596), (42, 493368), (48, 431697), (56, 370026), (61, 339696), (63, 328912), (72, 287798), (84, 246684), (112, 185013), (122, 169848), (126, 164456), (144, 143899), (168, 123342), (183, 113232), (244, 84924), (252, 82228), (336, 61671), (337, 61488), (366, 56616), (427, 48528), (488, 42462), (504, 41114), (549, 37744), (674, 30744), (732, 28308), (854, 24264), (976, 21231), (1008, 20557), (1011, 20496), (1098, 18872), (1281, 16176), (1348, 15372), (1464, 14154), (1708, 12132), (2022, 10248), (2196, 9436), (2359, 8784), (2562, 8088), (2696, 7686), (2928, 7077), (3033, 6832), (3416, 6066), (3843, 5392), (4044, 5124), (4392, 4718)]