20415980

素因数分解:

$2^2\times 5^1\times {\mathrm{13}}^1\times {\mathrm{17}}^1\times {\mathrm{31}}^1\times {\mathrm{149}}^1$

素因数の和:219

約数の個数: 96

約数和(自身を含む): 50803200

約数和(自身を除く): 30387220

約数列:

[1, 2, 4, 5, 10, 13, 17, 20, 26, 31, 34, 52, 62, 65, 68, 85, 124, 130, 149, 155, 170, 221, 260, 298, 310, 340, 403, 442, 527, 596, 620, 745, 806, 884, 1054, 1105, 1490, 1612, 1937, 2015, 2108, 2210, 2533, 2635, 2980, 3874, 4030, 4420, 4619, 5066, 5270, 6851, 7748, 8060, 9238, 9685, 10132, 10540, 12665, 13702, 18476, 19370, 23095, 25330, 27404, 32929, 34255, 38740, 46190, 50660, 60047, 65858, 68510, 78523, 92380, 120094, 131716, 137020, 157046, 164645, 240188, 300235, 314092, 329290, 392615, 600470, 658580, 785230, 1020799, 1200940, 1570460, 2041598, 4083196, 5103995, 10207990, 20415980]

約数ペア:

[(1, 20415980), (2, 10207990), (4, 5103995), (5, 4083196), (10, 2041598), (13, 1570460), (17, 1200940), (20, 1020799), (26, 785230), (31, 658580), (34, 600470), (52, 392615), (62, 329290), (65, 314092), (68, 300235), (85, 240188), (124, 164645), (130, 157046), (149, 137020), (155, 131716), (170, 120094), (221, 92380), (260, 78523), (298, 68510), (310, 65858), (340, 60047), (403, 50660), (442, 46190), (527, 38740), (596, 34255), (620, 32929), (745, 27404), (806, 25330), (884, 23095), (1054, 19370), (1105, 18476), (1490, 13702), (1612, 12665), (1937, 10540), (2015, 10132), (2108, 9685), (2210, 9238), (2533, 8060), (2635, 7748), (2980, 6851), (3874, 5270), (4030, 5066), (4420, 4619)]