20384980

素因数分解:

$2^2\times 5^1\times 7^2\times {\mathrm{11}}^1\times {\mathrm{31}}^1\times {\mathrm{61}}^1$

素因数の和:126

約数の個数: 144

約数和(自身を含む): 56996352

約数和(自身を除く): 36611372

約数列:

[1, 2, 4, 5, 7, 10, 11, 14, 20, 22, 28, 31, 35, 44, 49, 55, 61, 62, 70, 77, 98, 110, 122, 124, 140, 154, 155, 196, 217, 220, 244, 245, 305, 308, 310, 341, 385, 427, 434, 490, 539, 610, 620, 671, 682, 770, 854, 868, 980, 1078, 1085, 1220, 1342, 1364, 1519, 1540, 1705, 1708, 1891, 2135, 2156, 2170, 2387, 2684, 2695, 2989, 3038, 3355, 3410, 3782, 4270, 4340, 4697, 4774, 5390, 5978, 6076, 6710, 6820, 7564, 7595, 8540, 9394, 9455, 9548, 10780, 11935, 11956, 13237, 13420, 14945, 15190, 16709, 18788, 18910, 20801, 23485, 23870, 26474, 29890, 30380, 32879, 33418, 37820, 41602, 46970, 47740, 52948, 59780, 65758, 66185, 66836, 83204, 83545, 92659, 93940, 104005, 131516, 132370, 145607, 164395, 167090, 185318, 208010, 264740, 291214, 328790, 334180, 370636, 416020, 463295, 582428, 657580, 728035, 926590, 1019249, 1456070, 1853180, 2038498, 2912140, 4076996, 5096245, 10192490, 20384980]

約数ペア:

[(1, 20384980), (2, 10192490), (4, 5096245), (5, 4076996), (7, 2912140), (10, 2038498), (11, 1853180), (14, 1456070), (20, 1019249), (22, 926590), (28, 728035), (31, 657580), (35, 582428), (44, 463295), (49, 416020), (55, 370636), (61, 334180), (62, 328790), (70, 291214), (77, 264740), (98, 208010), (110, 185318), (122, 167090), (124, 164395), (140, 145607), (154, 132370), (155, 131516), (196, 104005), (217, 93940), (220, 92659), (244, 83545), (245, 83204), (305, 66836), (308, 66185), (310, 65758), (341, 59780), (385, 52948), (427, 47740), (434, 46970), (490, 41602), (539, 37820), (610, 33418), (620, 32879), (671, 30380), (682, 29890), (770, 26474), (854, 23870), (868, 23485), (980, 20801), (1078, 18910), (1085, 18788), (1220, 16709), (1342, 15190), (1364, 14945), (1519, 13420), (1540, 13237), (1705, 11956), (1708, 11935), (1891, 10780), (2135, 9548), (2156, 9455), (2170, 9394), (2387, 8540), (2684, 7595), (2695, 7564), (2989, 6820), (3038, 6710), (3355, 6076), (3410, 5978), (3782, 5390), (4270, 4774), (4340, 4697)]