18983980

素因数分解:

$2^2\times 5^1\times {\mathrm{29}}^1\times {\mathrm{71}}^1\times {\mathrm{461}}^1$

素因数の和:570

約数の個数: 48

約数和(自身を含む): 41912640

約数和(自身を除く): 22928660

約数列:

[1, 2, 4, 5, 10, 20, 29, 58, 71, 116, 142, 145, 284, 290, 355, 461, 580, 710, 922, 1420, 1844, 2059, 2305, 4118, 4610, 8236, 9220, 10295, 13369, 20590, 26738, 32731, 41180, 53476, 65462, 66845, 130924, 133690, 163655, 267380, 327310, 654620, 949199, 1898398, 3796796, 4745995, 9491990, 18983980]

約数ペア:

[(1, 18983980), (2, 9491990), (4, 4745995), (5, 3796796), (10, 1898398), (20, 949199), (29, 654620), (58, 327310), (71, 267380), (116, 163655), (142, 133690), (145, 130924), (284, 66845), (290, 65462), (355, 53476), (461, 41180), (580, 32731), (710, 26738), (922, 20590), (1420, 13369), (1844, 10295), (2059, 9220), (2305, 8236), (4118, 4610)]