21689720

素因数分解:

$2^3\times 5^1\times {\mathrm{13}}^1\times {\mathrm{53}}^1\times {\mathrm{787}}^1$

素因数の和:864

約数の個数: 64

約数和(自身を含む): 53615520

約数和(自身を除く): 31925800

約数列:

[1, 2, 4, 5, 8, 10, 13, 20, 26, 40, 52, 53, 65, 104, 106, 130, 212, 260, 265, 424, 520, 530, 689, 787, 1060, 1378, 1574, 2120, 2756, 3148, 3445, 3935, 5512, 6296, 6890, 7870, 10231, 13780, 15740, 20462, 27560, 31480, 40924, 41711, 51155, 81848, 83422, 102310, 166844, 204620, 208555, 333688, 409240, 417110, 542243, 834220, 1084486, 1668440, 2168972, 2711215, 4337944, 5422430, 10844860, 21689720]

約数ペア:

[(1, 21689720), (2, 10844860), (4, 5422430), (5, 4337944), (8, 2711215), (10, 2168972), (13, 1668440), (20, 1084486), (26, 834220), (40, 542243), (52, 417110), (53, 409240), (65, 333688), (104, 208555), (106, 204620), (130, 166844), (212, 102310), (260, 83422), (265, 81848), (424, 51155), (520, 41711), (530, 40924), (689, 31480), (787, 27560), (1060, 20462), (1378, 15740), (1574, 13780), (2120, 10231), (2756, 7870), (3148, 6890), (3445, 6296), (3935, 5512)]