21786860

素因数分解:

$2^2\times 5^1\times {\mathrm{17}}^1\times {\mathrm{139}}^1\times {\mathrm{461}}^1$

素因数の和:626

約数の個数: 48

約数和(自身を含む): 48898080

約数和(自身を除く): 27111220

約数列:

[1, 2, 4, 5, 10, 17, 20, 34, 68, 85, 139, 170, 278, 340, 461, 556, 695, 922, 1390, 1844, 2305, 2363, 2780, 4610, 4726, 7837, 9220, 9452, 11815, 15674, 23630, 31348, 39185, 47260, 64079, 78370, 128158, 156740, 256316, 320395, 640790, 1089343, 1281580, 2178686, 4357372, 5446715, 10893430, 21786860]

約数ペア:

[(1, 21786860), (2, 10893430), (4, 5446715), (5, 4357372), (10, 2178686), (17, 1281580), (20, 1089343), (34, 640790), (68, 320395), (85, 256316), (139, 156740), (170, 128158), (278, 78370), (340, 64079), (461, 47260), (556, 39185), (695, 31348), (922, 23630), (1390, 15674), (1844, 11815), (2305, 9452), (2363, 9220), (2780, 7837), (4610, 4726)]