21010840

素因数分解:

$2^3\times 5^1\times {\mathrm{61}}^1\times {\mathrm{79}}^1\times {\mathrm{109}}^1$

素因数の和:260

約数の個数: 64

約数和(自身を含む): 49104000

約数和(自身を除く): 28093160

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 61, 79, 109, 122, 158, 218, 244, 305, 316, 395, 436, 488, 545, 610, 632, 790, 872, 1090, 1220, 1580, 2180, 2440, 3160, 4360, 4819, 6649, 8611, 9638, 13298, 17222, 19276, 24095, 26596, 33245, 34444, 38552, 43055, 48190, 53192, 66490, 68888, 86110, 96380, 132980, 172220, 192760, 265960, 344440, 525271, 1050542, 2101084, 2626355, 4202168, 5252710, 10505420, 21010840]

約数ペア:

[(1, 21010840), (2, 10505420), (4, 5252710), (5, 4202168), (8, 2626355), (10, 2101084), (20, 1050542), (40, 525271), (61, 344440), (79, 265960), (109, 192760), (122, 172220), (158, 132980), (218, 96380), (244, 86110), (305, 68888), (316, 66490), (395, 53192), (436, 48190), (488, 43055), (545, 38552), (610, 34444), (632, 33245), (790, 26596), (872, 24095), (1090, 19276), (1220, 17222), (1580, 13298), (2180, 9638), (2440, 8611), (3160, 6649), (4360, 4819)]