20781280

素因数分解:

$2^5\times 5^1\times {\mathrm{13}}^1\times {\mathrm{97}}^1\times {\mathrm{103}}^1$

素因数の和:228

約数の個数: 96

約数和(自身を含む): 53936064

約数和(自身を除く): 33154784

約数列:

[1, 2, 4, 5, 8, 10, 13, 16, 20, 26, 32, 40, 52, 65, 80, 97, 103, 104, 130, 160, 194, 206, 208, 260, 388, 412, 416, 485, 515, 520, 776, 824, 970, 1030, 1040, 1261, 1339, 1552, 1648, 1940, 2060, 2080, 2522, 2678, 3104, 3296, 3880, 4120, 5044, 5356, 6305, 6695, 7760, 8240, 9991, 10088, 10712, 12610, 13390, 15520, 16480, 19982, 20176, 21424, 25220, 26780, 39964, 40352, 42848, 49955, 50440, 53560, 79928, 99910, 100880, 107120, 129883, 159856, 199820, 201760, 214240, 259766, 319712, 399640, 519532, 649415, 799280, 1039064, 1298830, 1598560, 2078128, 2597660, 4156256, 5195320, 10390640, 20781280]

約数ペア:

[(1, 20781280), (2, 10390640), (4, 5195320), (5, 4156256), (8, 2597660), (10, 2078128), (13, 1598560), (16, 1298830), (20, 1039064), (26, 799280), (32, 649415), (40, 519532), (52, 399640), (65, 319712), (80, 259766), (97, 214240), (103, 201760), (104, 199820), (130, 159856), (160, 129883), (194, 107120), (206, 100880), (208, 99910), (260, 79928), (388, 53560), (412, 50440), (416, 49955), (485, 42848), (515, 40352), (520, 39964), (776, 26780), (824, 25220), (970, 21424), (1030, 20176), (1040, 19982), (1261, 16480), (1339, 15520), (1552, 13390), (1648, 12610), (1940, 10712), (2060, 10088), (2080, 9991), (2522, 8240), (2678, 7760), (3104, 6695), (3296, 6305), (3880, 5356), (4120, 5044)]